{"id":893,"date":"2026-05-14T16:27:00","date_gmt":"2026-05-14T15:27:00","guid":{"rendered":"http:\/\/seamlessbio.de\/?page_id=893"},"modified":"2026-07-16T08:54:03","modified_gmt":"2026-07-16T07:54:03","slug":"migrations-scratch-assay","status":"publish","type":"page","link":"https:\/\/seamlessbio.de\/de\/migration-scratch-assay\/","title":{"rendered":"Anwendungsmigration \/ Scratch-Assay"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\n\n\n\n\nMigration Scratch Assay \u2014 Complete Protocol & Optimization Guide | SeamlessBio<\/title>\n<style>\n \/* \u2500\u2500 Design System \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n :root {\n --teal: #18b7b2;\n --teal-dark: #139b97;\n --teal-pale: #e9fbfa;\n --dark: #1a2e35;\n --mid: #2e4a54;\n --grey: #f4f6f7;\n --border: #d8e8e7;\n --text: #2c3e3f;\n --muted: #6b7f82;\n --white: #ffffff;\n --orange: #e07b00;\n }\n\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n body {\n font-family: 'Helvetica Neue', Arial, sans-serif;\n font-size: 16px;\n line-height: 1.7;\n color: var(--text);\n background: var(--white);\n max-width: 1100px;\n margin: 0 auto;\n padding: 0 20px;\n }\n\n \/* \u2500\u2500 Typography \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n h1 { font-size: 32px; font-weight: 700; color: var(--dark); line-height: 1.2; margin-bottom: 16px; }\n h2 { font-size: 22px; font-weight: 700; color: var(--dark); margin: 48px 0 16px; padding-bottom: 8px; border-bottom: 2px solid var(--teal); }\n h3 { font-size: 17px; font-weight: 700; color: var(--dark); margin: 24px 0 10px; }\n p { margin-bottom: 14px; }\n a { color: var(--teal-dark); text-decoration: none; }\n a:hover { text-decoration: underline; }\n ul, ol { padding-left: 20px; margin-bottom: 14px; }\n li { margin-bottom: 6px; }\n strong { color: var(--dark); }\n\n \/* \u2500\u2500 Hero \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .hero {\n background: linear-gradient(135deg, #18b7b2 0%, #62d0cc 60%, #a8e6e4 100%);\n border-radius: 16px;\n padding: 48px 40px;\n margin: 32px 0 40px;\n color: var(--white);\n display: grid;\n grid-template-columns: 1fr 200px;\n gap: 32px;\n align-items: center;\n }\n .hero-left {}\n .hero-right { display: flex; flex-direction: column; gap: 16px; }\n .hero-stat {\n background: rgba(0,0,0,0.15);\n border-radius: 12px;\n padding: 20px;\n text-align: center;\n color: var(--white);\n }\n .hero-stat .stat-num { font-size: 32px; font-weight: 700; line-height: 1; }\n .hero-stat .stat-label { font-size: 13px; color: rgba(255,255,255,0.85); margin-top: 6px; }\n .hero .eyebrow {\n display: inline-block;\n font-size: 11px;\n font-weight: 700;\n letter-spacing: 1.5px;\n text-transform: uppercase;\n color: rgba(255,255,255,0.9);\n background: rgba(255,255,255,0.2);\n border-radius: 20px;\n padding: 4px 14px;\n margin-bottom: 16px;\n }\n .hero h1 { color: var(--white); font-size: 32px; font-weight: 800; line-height: 1.2; margin-bottom: 16px; text-shadow: 0 1px 3px rgba(0,0,0,0.25); }\n .hero .lead {\n font-size: 16px;\n color: rgba(255,255,255,0.95);\n margin: 0 0 24px;\n line-height: 1.6;\n text-shadow: 0 1px 2px rgba(0,0,0,0.2);\n }\n .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }\n .tag {\n background: rgba(0,0,0,0.15);\n border: 1px solid rgba(255,255,255,0.3);\n color: var(--white);\n font-size: 12px;\n font-weight: 600;\n padding: 4px 12px;\n border-radius: 20px;\n text-shadow: 0 1px 2px rgba(0,0,0,0.2);\n }\n @media (max-width: 640px) {\n .hero { grid-template-columns: 1fr; }\n .hero-right { flex-direction: row; }\n .hero-stat { flex: 1; }\n }\n\n \/* \u2500\u2500 Quick Answer Box (AEO) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .quick-answer {\n background: var(--teal-pale);\n border-left: 4px solid var(--teal);\n border-radius: 0 8px 8px 0;\n padding: 20px 24px;\n margin: 0 0 40px;\n }\n .quick-answer .qa-label {\n font-size: 11px;\n font-weight: 700;\n text-transform: uppercase;\n letter-spacing: 1px;\n color: var(--teal-dark);\n margin-bottom: 8px;\n }\n .quick-answer p { margin: 0; font-size: 15px; }\n\n \/* \u2500\u2500 Table of Contents \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .toc {\n background: var(--grey);\n border-radius: 8px;\n padding: 20px 24px;\n margin-bottom: 40px;\n }\n .toc h4 { font-size: 13px; 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}\n .step-body h3 { margin: 0 0 6px; font-size: 16px; }\n .step-body p { margin: 0; font-size: 15px; }\n\n \/* \u2500\u2500 Spec table \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .spec-table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 15px; }\n .spec-table th {\n background: var(--dark);\n color: var(--white);\n padding: 10px 14px;\n text-align: left;\n font-size: 13px;\n font-weight: 600;\n }\n .spec-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }\n .spec-table tr:nth-child(even) td { background: var(--grey); }\n\n \/* \u2500\u2500 Critical parameter cards \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .param-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 20px 0 32px; }\n .param-card {\n background: var(--white);\n border: 1px solid var(--border);\n border-top: 3px solid var(--teal);\n border-radius: 8px;\n padding: 16px 18px;\n }\n .param-card .param-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); margin-bottom: 6px; }\n .param-card .param-value { font-size: 20px; font-weight: 700; color: var(--dark); }\n .param-card .param-note { font-size: 13px; color: var(--muted); margin-top: 4px; }\n\n \/* \u2500\u2500 Product CTA cards \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin: 24px 0; }\n .product-card {\n border: 1px solid var(--border);\n border-radius: 10px;\n padding: 22px 24px;\n background: var(--white);\n }\n .product-card .product-type {\n font-size: 11px;\n font-weight: 700;\n text-transform: uppercase;\n letter-spacing: 1px;\n color: var(--teal-dark);\n margin-bottom: 8px;\n }\n .product-card h3 { font-size: 16px; margin: 0 0 10px; }\n .product-card p { font-size: 14px; color: var(--muted); margin: 0 0 16px; }\n .btn {\n display: inline-block;\n padding: 9px 18px;\n border-radius: 6px;\n font-size: 13px;\n font-weight: 700;\n text-decoration: none;\n }\n .btn-primary { background: var(--dark); color: var(--white); }\n .btn-outline { border: 2px solid var(--dark); color: var(--dark); }\n .btn:hover { opacity: 0.85; }\n\n \/* \u2500\u2500 zenCELL highlight \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .zencell-box {\n background: linear-gradient(135deg, var(--dark) 0%, var(--mid) 100%);\n color: var(--white);\n border-radius: 12px;\n padding: 32px 36px;\n margin: 40px 0;\n }\n .zencell-box .zc-label {\n font-size: 11px;\n font-weight: 700;\n letter-spacing: 1.5px;\n text-transform: uppercase;\n color: var(--teal);\n margin-bottom: 10px;\n }\n .zencell-box h2 {\n color: var(--white);\n border: none;\n margin: 0 0 12px;\n font-size: 22px;\n padding: 0;\n }\n .zencell-box p { color: rgba(255,255,255,0.85); margin-bottom: 10px; font-size: 15px; }\n .zencell-features { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0 24px; }\n .zencell-feat {\n background: rgba(24,183,178,0.2);\n border: 1px solid rgba(24,183,178,0.4);\n color: var(--teal);\n font-size: 13px;\n font-weight: 600;\n padding: 5px 14px;\n border-radius: 20px;\n }\n .btn-teal { background: var(--teal); color: var(--white); }\n\n \/* \u2500\u2500 FAQ \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .faq-item { border-bottom: 1px solid var(--border); padding: 18px 0; }\n .faq-item:last-child { border: none; }\n .faq-q { font-weight: 700; color: var(--dark); margin-bottom: 8px; font-size: 16px; }\n .faq-a { font-size: 15px; color: var(--text); margin: 0; }\n\n \/* \u2500\u2500 Warning \/ Note boxes \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .note-box {\n background: #fff8e6;\n border-left: 4px solid var(--orange);\n border-radius: 0 6px 6px 0;\n padding: 14px 18px;\n margin: 16px 0;\n font-size: 14px;\n }\n .note-box strong { color: var(--orange); }\n\n \/* \u2500\u2500 Related Applications \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .related-box {\n background: var(--grey);\n border-radius: 12px;\n padding: 28px 32px;\n margin: 48px 0 24px;\n }\n .related-title {\n font-size: 16px;\n font-weight: 700;\n color: var(--dark);\n margin: 0 0 20px;\n }\n .related-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 12px;\n }\n .related-link {\n display: block;\n border: 1px solid var(--border);\n border-radius: 8px;\n padding: 14px 18px;\n background: var(--white);\n font-size: 14px;\n font-weight: 500;\n color: var(--dark);\n text-decoration: none;\n transition: border-color 0.2s;\n }\n .related-link:hover { border-color: var(--teal); color: var(--teal-dark); text-decoration: none; }\n\n \/* \u2500\u2500 Back link \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .back-link-wrap { text-align: center; margin: 24px 0 40px; }\n .back-link { color: var(--teal-dark); font-weight: 600; font-size: 15px; text-decoration: none; }\n .back-link:hover { text-decoration: underline; }\n\n \/* \u2500\u2500 CTA Box \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n .cta-box {\n background: var(--grey);\n border-radius: 12px;\n padding: 48px 40px;\n text-align: center;\n margin-bottom: 48px;\n }\n .cta-title { font-size: 26px; 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}\n\n @media (max-width: 640px) {\n .related-grid { grid-template-columns: 1fr; }\n .cta-box { padding: 32px 20px; }\n }\n\n \/* \u2500\u2500 Responsive \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n @media (max-width: 640px) {\n .hero { padding: 32px 24px; }\n h1 { font-size: 24px; }\n h2 { font-size: 19px; }\n .zencell-box { padding: 24px 20px; }\n }\n<\/style>\n<\/head>\n<body>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n HERO\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"hero\">\n <div class=\"hero-left\">\n <div class=\"eyebrow\">Application Guide \u00b7 Cell Migration<\/div>\n <h1>Migration Scratch Assay \u2014 Complete Protocol & Optimization Guide<\/h1>\n <p class=\"lead\">Everything you need to run a reproducible wound healing assay: step-by-step protocol, serum strategy, common pitfalls, and automated quantification with live cell imaging.<\/p>\n <div class=\"hero-tags\">\n <span class=\"tag\">Wound Healing Assay<\/span>\n <span class=\"tag\">Cell Migration<\/span>\n <span class=\"tag\">Cancer Research<\/span>\n <span class=\"tag\">Drug Screening<\/span>\n <span class=\"tag\">FBS Optimization<\/span>\n <span class=\"tag\">Live Cell Imaging<\/span>\n <\/div>\n <\/div>\n <div class=\"hero-right\">\n <div class=\"hero-stat\">\n <div class=\"stat-num\">6<\/div>\n <div class=\"stat-label\">Protocol steps<\/div>\n <\/div>\n <div class=\"hero-stat\">\n <div class=\"stat-num\">7<\/div>\n <div class=\"stat-label\">FAQ answered<\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n AEO QUICK ANSWER\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"quick-answer\">\n <div class=\"qa-label\">Quick Answer<\/div>\n <p><strong>What is a migration scratch assay?<\/strong> The scratch assay (wound healing assay) is an in vitro method to measure collective cell migration. A defined gap is introduced into a confluent monolayer using a pipette tip. Images are captured at T=0 and at regular intervals until wound closure. The rate of gap closure quantifies migratory capacity under experimental conditions \u2014 routinely used in cancer research, drug discovery, wound biology, and biomaterial testing.<\/p>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n TABLE OF CONTENTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"toc\">\n <h4>Contents<\/h4>\n <ol>\n <li><a href=\"#principle\">Assay principle & applications<\/a><\/li>\n <li><a href=\"#protocol\">Step-by-step protocol<\/a><\/li>\n <li><a href=\"#serum\">Serum strategy: which FBS grade to use<\/a><\/li>\n <li><a href=\"#critical\">Critical parameters & common mistakes<\/a><\/li>\n <li><a href=\"#quantification\">Quantification & live cell imaging<\/a><\/li>\n <li><a href=\"#products\">Recommended reagents from SeamlessBio<\/a><\/li>\n <li><a href=\"#faq\">FAQ<\/a><\/li>\n <\/ol>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 1. PRINCIPLE\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"principle\">1. Assay Principle & Applications<\/h2>\n\n<p>The in vitro scratch assay \u2014 also called the wound healing assay \u2014 simulates collective cell migration by introducing a cell-free zone into a confluent monolayer. Cells at the leading edge sense the open space and migrate inward, driven by cytoskeletal reorganization and cell-cell signalling. The rate of gap closure is a direct readout of migratory capacity under a defined set of conditions.<\/p>\n\n<p>The assay is particularly valued for its simplicity, low cost, and compatibility with standard multi-well plates and live-cell imaging systems. Unlike Transwell (Boyden chamber) assays \u2014 which measure chemotactic migration through a membrane \u2014 the scratch assay captures <strong>collective lateral movement<\/strong>, making it more representative of epithelial sheet migration in wound repair and tumour invasion.<\/p>\n\n<h3>Key applications<\/h3>\n<ul>\n <li><strong>Cancer biology:<\/strong> Measuring the effect of oncogenes, siRNA knockdowns, or drug candidates on tumour cell migration and invasion potential<\/li>\n <li><strong>Drug discovery & screening:<\/strong> High-throughput testing of anti-migratory compounds, kinase inhibitors, and cytokine modulators<\/li>\n <li><strong>Wound healing research:<\/strong> Evaluating keratinocyte and fibroblast responses to growth factors, biomaterials, or therapeutic peptides<\/li>\n <li><strong>Cell biology:<\/strong> Characterising actin dynamics, focal adhesion turnover, and EMT (epithelial-mesenchymal transition)<\/li>\n <li><strong>Biomaterial testing:<\/strong> Assessing scaffold or coating biocompatibility on cell migration behaviour<\/li>\n<\/ul>\n\n<p>Common cell lines used: HeLa, A549, MCF-7, MDA-MB-231, HCT116, HUVEC, HEKa, NIH 3T3, Vero, CHO \u2014 and primary cells including keratinocytes, fibroblasts, and endothelial cells.<\/p>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 2. PROTOCOL\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"protocol\">2. Step-by-Step Protocol<\/h2>\n\n<div class=\"steps\">\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Seed cells to confluency<\/h3>\n <p>Seed cells in 6-well or 24-well plates at a density that will reach 90\u2013100% confluency within 24 h. For most adherent cancer cell lines (HeLa, A549, MCF-7): 2\u20134 \u00d7 10\u2075 cells\/well in a 6-well plate. Culture in standard growth medium containing 10% FBS until a tight monolayer is formed.<\/p>\n <\/div>\n <\/div>\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Serum starvation (optional but recommended)<\/h3>\n <p>Replace medium with serum-free or low-serum (0.5\u20131% FBS) medium for 16\u201324 h prior to scratching. This synchronises the cell cycle and suppresses proliferation, ensuring that gap closure reflects <em>migration<\/em> rather than combined migration + proliferation. Skip starvation only if your specific cell line cannot tolerate serum deprivation.<\/p>\n <\/div>\n <\/div>\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Introduce the scratch<\/h3>\n <p>Use a sterile 200 \u00b5L pipette tip held perpendicular (90\u00b0) to the well surface. Apply consistent, gentle pressure and draw a straight line across the centre of the monolayer in a single continuous motion. Immediately wash wells twice with PBS to remove dislodged cells and debris. Mark the plate underside with a permanent marker at each end of the scratch for positional reference.<\/p>\n <\/div>\n <\/div>\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Capture T=0 image<\/h3>\n <p>Image each well immediately after washing. For manual microscopy: take 3\u20135 sequential images along the scratch length at 4\u00d7 or 10\u00d7 magnification, covering at least 70% of the scratch. For automated live-cell imaging: define the imaging position and set up a time-lapse protocol (recommended interval: 30 min to 2 h depending on cell line motility).<\/p>\n <\/div>\n <\/div>\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Add treatment medium & incubate<\/h3>\n <p>Replace with assay medium containing your test compound, inhibitor, or growth factor at the desired concentration. Use low-serum medium (1\u20132% FBS) to minimise proliferation unless your experiment specifically requires growth factor signalling from serum. Incubate at 37\u00b0C, 5% CO\u2082.<\/p>\n <\/div>\n <\/div>\n\n <div class=\"step\">\n <div class=\"step-num\"><\/div>\n <div class=\"step-body\">\n <h3>Capture timepoint images & calculate wound closure<\/h3>\n <p>Image at defined intervals (typically 0, 6, 12, 24 h) at the same positions. Calculate the percentage wound closure: <strong>% Closure = [(Area T0 \u2212 Area T\u2099) \/ Area T0] \u00d7 100<\/strong>. For automated quantification, use integrated live-cell imager software or ImageJ with the MRI Wound Healing macro.<\/p>\n <\/div>\n <\/div>\n\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n CRITICAL PARAMETERS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"critical\">3. Critical Parameters & Common Mistakes<\/h2>\n\n<div class=\"param-grid\">\n <div class=\"param-card\">\n <div class=\"param-label\">Serum during assay<\/div>\n <div class=\"param-value\">0.5\u20132%<\/div>\n <div class=\"param-note\">FBS concentration during gap closure phase<\/div>\n <\/div>\n <div class=\"param-card\">\n <div class=\"param-label\">Starvation duration<\/div>\n <div class=\"param-value\">16\u201324 h<\/div>\n <div class=\"param-note\">Before scratch to suppress proliferation<\/div>\n <\/div>\n <div class=\"param-card\">\n <div class=\"param-label\">Confluency at scratch<\/div>\n <div class=\"param-value\">90\u2013100%<\/div>\n <div class=\"param-note\">Gaps in monolayer introduce artefacts<\/div>\n <\/div>\n <div class=\"param-card\">\n <div class=\"param-label\">Imaging positions<\/div>\n <div class=\"param-value\">\u2265 3\u20135<\/div>\n <div class=\"param-note\">Per well, covering >70% of scratch length<\/div>\n <\/div>\n <div class=\"param-card\">\n <div class=\"param-label\">Pipette tip angle<\/div>\n <div class=\"param-value\">90\u00b0<\/div>\n <div class=\"param-note\">Perpendicular to surface for consistent width<\/div>\n <\/div>\n <div class=\"param-card\">\n <div class=\"param-label\">PBS washes after scratch<\/div>\n <div class=\"param-value\">2\u00d7<\/div>\n <div class=\"param-note\">Remove debris for clear imaging<\/div>\n <\/div>\n<\/div>\n\n<h3>Most common failure modes<\/h3>\n<table class=\"spec-table\">\n <tr>\n <th>Problem<\/th>\n <th>Cause<\/th>\n <th>Solution<\/th>\n <\/tr>\n <tr>\n <td>Inconsistent scratch width<\/td>\n <td>Variable pipette angle or pressure<\/td>\n <td>Use commercial scratch guides or 96-well wound-making tools; always hold tip at 90\u00b0<\/td>\n <\/tr>\n <tr>\n <td>Wound closes too fast (<12 h)<\/td>\n <td>High serum or highly motile cell line<\/td>\n <td>Reduce FBS to 0.5\u20131%; add mitomycin C (10 \u00b5g\/mL, 2 h) to block proliferation<\/td>\n <\/tr>\n <tr>\n <td>Wound does not close<\/td>\n <td>Cells damaged during starvation or scratch<\/td>\n <td>Reduce starvation time; verify cell viability pre-scratch; check CO\u2082 and temperature<\/td>\n <\/tr>\n <tr>\n <td>High well-to-well variability<\/td>\n <td>Uneven scratch length or imaging at different positions<\/td>\n <td>Mark plate; image at identical positions; quantify 70\u201380% of scratch per well<\/td>\n <\/tr>\n <tr>\n <td>Cell debris in scratch<\/td>\n <td>Incomplete PBS wash<\/td>\n <td>Wash 2\u20133\u00d7 with warm PBS immediately after scratching<\/td>\n <\/tr>\n <tr>\n <td>Cannot distinguish migration from proliferation<\/td>\n <td>No proliferation control<\/td>\n <td>Include a mitomycin C-treated control arm; use live-cell imaging for kinetic separation<\/td>\n <\/tr>\n<\/table>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 4. SERUM STRATEGY\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"serum\">4. Serum Strategy: Which FBS Grade to Use<\/h2>\n\n<p>Serum plays a dual role in the scratch assay \u2014 it supports cell survival and provides growth factors that stimulate migration. The key challenge is <strong>decoupling migration from proliferation<\/strong>. The serum strategy is therefore one of the most critical experimental decisions.<\/p>\n\n<h3>Phase 1 \u2014 Cell expansion (pre-assay)<\/h3>\n<p>Use <strong>standard FBS at 10%<\/strong> for routine cell culture to reach confluency. Consistent lot-to-lot quality is important here \u2014 batch-to-batch variation in growth factor content directly affects how fast cells reach confluency and their baseline migratory phenotype. Batch reservation is strongly recommended for longitudinal studies.<\/p>\n\n<h3>Phase 2 \u2014 Starvation medium<\/h3>\n<p>Replace with <strong>serum-free medium<\/strong> or <strong>0.5% FBS<\/strong> for 16\u201324 h before scratching. This synchronises the cell cycle, reduces basal ERK\/PI3K signalling, and ensures that wound-induced migration is the dominant behaviour observed. For primary cells or sensitive lines that cannot tolerate complete serum withdrawal, 0.5\u20131% FBS maintains viability without stimulating proliferation significantly.<\/p>\n\n<h3>Phase 3 \u2014 Assay medium (during gap closure)<\/h3>\n<p>Run the migration phase in <strong>1\u20132% FBS medium<\/strong> unless your assay specifically tests the effect of serum components. For drug screening applications where endotoxin may confound cytokine-driven signalling, consider <strong>Low Endotoxin FBS (<1 EU\/mL)<\/strong> to eliminate background LPS-driven inflammatory responses.<\/p>\n\n<div class=\"note-box\">\n <strong>Important:<\/strong> For cytokine or growth factor screening (TGF-\u03b2, EGF, VEGF etc.), use <strong>Low Endotoxin FBS<\/strong> to prevent endotoxin from confounding receptor-mediated signalling responses. Standard FBS endotoxin levels vary between lots and can reach 1\u20135 EU\/mL, which is sufficient to activate TLR4 and NF-\u03baB pathways.\n<\/div>\n\n<h3>FBS grade selection summary<\/h3>\n<table class=\"spec-table\">\n <tr>\n <th>Application<\/th>\n <th>Recommended Grade<\/th>\n <th>Concentration<\/th>\n <\/tr>\n <tr>\n <td>Cell expansion to confluency<\/td>\n <td><a href=\"https:\/\/seamlessbio.de\/products\/fbs-standard\/\">FBS Standard<\/a><\/td>\n <td>10%<\/td>\n <\/tr>\n <tr>\n <td>Starvation (serum-sensitive lines)<\/td>\n <td><a href=\"https:\/\/seamlessbio.de\/products\/fbs-standard\/\">FBS Standard<\/a><\/td>\n <td>0.5\u20131%<\/td>\n <\/tr>\n <tr>\n <td>Migration phase (standard)<\/td>\n <td><a href=\"https:\/\/seamlessbio.de\/products\/fbs-standard\/\">FBS Standard<\/a><\/td>\n <td>1\u20132%<\/td>\n <\/tr>\n <tr>\n <td>Drug \/ cytokine screening<\/td>\n <td><a href=\"https:\/\/seamlessbio.de\/products\/fbs-low-endotoxin\/\">FBS Low Endotoxin<\/a> (<1 EU\/mL)<\/td>\n <td>1\u20132%<\/td>\n <\/tr>\n <tr>\n <td>Antibody-dependent assays<\/td>\n <td><a href=\"https:\/\/seamlessbio.de\/products\/fbs-low-igg\/\">FBS Low IgG<\/a> (<200 \u00b5g\/mL)<\/td>\n <td>1\u201310%<\/td>\n <\/tr>\n<\/table>\n\n<p>All SeamlessBio FBS lots are sourced from South America (standard), processed and QC-tested in Germany, and shipped with full CoA including sterility, mycoplasma, endotoxin (LAL), and viral safety panel (BVDV, BHV-1, PI-3). <a href=\"https:\/\/seamlessbio.de\/products\/fetal-bovine-serum\/\">View FBS portfolio \u2192<\/a><\/p>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 5. QUANTIFICATION & LIVE CELL IMAGING\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"quantification\">5. Quantification & Live Cell Imaging<\/h2>\n\n<p>Accurate, reproducible quantification is the most frequently cited weakness of the scratch assay. Manual measurement from a single field of view introduces significant intra- and interobserver variability. Studies have shown that imaging at least 3\u20135 positions per well and covering >70% of scratch length substantially reduces variability and improves assay sensitivity.<\/p>\n\n<h3>Analysis approaches<\/h3>\n<ul>\n <li><strong>ImageJ \/ FIJI:<\/strong> The MRI Wound Healing Tool (free, open source) measures scratch area from brightfield images. Suitable for low-throughput studies; requires consistent image acquisition.<\/li>\n <li><strong>Automated live-cell imaging:<\/strong> Enables continuous time-lapse without disturbing the incubator environment, captures the kinetics of wound closure (not just endpoint), and allows software-assisted edge detection for objective quantification. Eliminates positional variability entirely.<\/li>\n <li><strong>Commercial software:<\/strong> IncuCyte (Sartorius), Cellomics, or integrated analysis in live cell imagers provide automated wound area quantification with minimal manual intervention.<\/li>\n<\/ul>\n\n<!-- zenCELL OWL highlight -->\n<div class=\"zencell-box\">\n <div class=\"zc-label\">Recommended Imaging Solution<\/div>\n <h2>zenCELL owl \u2014 Live Cell Imager for Scratch Assay<\/h2>\n <p>The zenCELL owl is a compact live-cell imager that sits inside your standard CO\u2082 incubator and captures brightfield time-lapse images automatically. For scratch assays, this eliminates the need to remove plates from the incubator between imaging time points \u2014 reducing temperature fluctuation artifacts and enabling continuous kinetic data.<\/p>\n <p>Unlike large-footprint plate readers or microscopes, the owl is designed for standard 6-well and 24-well plates used in routine scratch assays. Images are acquired at defined intervals and exported for analysis in ImageJ, the integrated software, or your preferred platform.<\/p>\n <div class=\"zencell-features\">\n <span class=\"zencell-feat\">Incubator-compatible<\/span>\n <span class=\"zencell-feat\">Brightfield time-lapse<\/span>\n <span class=\"zencell-feat\">6-well & 24-well compatible<\/span>\n <span class=\"zencell-feat\">Kinetic wound closure data<\/span>\n <span class=\"zencell-feat\">No sample disturbance<\/span>\n <\/div>\n <a href=\"https:\/\/www.zencellowl.com\" target=\"_blank\" rel=\"noopener\" class=\"btn btn-teal\">Learn more about zenCELL owl \u2192<\/a>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 6. PRODUCTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"products\">6. Recommended Reagents from SeamlessBio<\/h2>\n\n<div class=\"product-grid\">\n\n <div class=\"product-card\">\n <div class=\"product-type\">Primary Reagent<\/div>\n <h3>FBS Standard<\/h3>\n <p>Routine cell expansion and migration assays. South American origin, processed in Germany. Full CoA included.<\/p>\n <a href=\"https:\/\/seamlessbio.de\/products\/fbs-standard\/\" class=\"btn btn-primary\">View FBS Standard \u2192<\/a>\n <\/div>\n\n <div class=\"product-card\">\n <div class=\"product-type\">Drug Screening Applications<\/div>\n <h3>FBS Low Endotoxin<\/h3>\n <p><1 EU\/mL endotoxin. Essential for cytokine and growth factor studies where LPS interference must be excluded.<\/p>\n <a href=\"https:\/\/seamlessbio.de\/products\/fbs-low-endotoxin\/\" class=\"btn btn-primary\">View Low Endotoxin FBS \u2192<\/a>\n <\/div>\n\n <div class=\"product-card\">\n <div class=\"product-type\">Blocking & Coating<\/div>\n <h3>BSA \u2014 Bovine Serum Albumin<\/h3>\n <p>Used in blocking steps, drug solubilisation (e.g. TGF-\u03b2 reconstitution at 1 mg\/mL BSA in HCl), and serum-free formulations.<\/p>\n <a href=\"https:\/\/seamlessbio.de\/products\/bsa\/\" class=\"btn btn-primary\">View BSA \u2192<\/a>\n <\/div>\n\n <div class=\"product-card\">\n <div class=\"product-type\">Imaging Partner<\/div>\n <h3>zenCELL owl<\/h3>\n <p>Incubator-based live cell imager for automated scratch assay time-lapse. Available via innoME.<\/p>\n <a href=\"https:\/\/www.zencellowl.com\" target=\"_blank\" rel=\"noopener\" class=\"btn btn-outline\">Learn More \u2192<\/a>\n <\/div>\n\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n 7. FAQ (AEO)\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<h2 id=\"faq\">7. FAQ<\/h2>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">What is the difference between a scratch assay and a Transwell migration assay?<\/div>\n <p class=\"faq-a\">The scratch assay measures <strong>collective lateral migration<\/strong> of a cell monolayer across a two-dimensional surface. The Transwell (Boyden chamber) assay measures <strong>chemotactic migration<\/strong> of individual cells through a membrane pore toward a chemoattractant gradient. The scratch assay is better for studying collective behaviour, wound repair biology, and epithelial sheet dynamics. Transwell is preferred for directional chemotaxis and single-cell invasion studies.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">Should I use serum-free medium during the scratch assay?<\/div>\n <p class=\"faq-a\">It depends on your goal. If you want to measure <strong>pure migration<\/strong> (not proliferation), use 0\u20131% FBS during the gap closure phase. Serum-free medium works for robust cell lines but can cause apoptosis in sensitive or primary cells. A practical compromise is 1% FBS with a 16\u201324 h starvation period before scratching. For cytokine-stimulated migration assays, use Low Endotoxin FBS to eliminate TLR4 background activation.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">How do I separate migration from proliferation in the scratch assay?<\/div>\n <p class=\"faq-a\">Three approaches are standard: (1) <strong>Serum starvation<\/strong> before scratching to suppress proliferative signalling. (2) <strong>Mitomycin C<\/strong> (10 \u00b5g\/mL, 2 h pre-scratch) to block cell division without affecting migration directly. (3) <strong>Live cell imaging kinetics<\/strong> \u2014 continuous time-lapse allows you to observe the leading edge velocity separately from the bulk area increase caused by division.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">What cell density should I use for a scratch assay?<\/div>\n <p class=\"faq-a\">Aim for 90\u2013100% confluency at the time of scratching. Sub-confluent monolayers have gaps that create artefactual \"pseudo-wounds\" and result in variable scratch widths. For most cancer cell lines in 6-well plates, seeding 2\u20134 \u00d7 10\u2075 cells\/well the evening before the assay achieves this. Optimise for your specific cell line \u2014 fast-growing lines may need lower seeding density.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">How do I quantify wound closure accurately?<\/div>\n <p class=\"faq-a\">Image at least 3\u20135 positions per well (covering \u226570% of scratch length) at each time point. Use ImageJ with the MRI Wound Healing Tool, or automated analysis via a live cell imager. Calculate: % Wound Closure = [(A\u2080 \u2212 A\u209c) \/ A\u2080] \u00d7 100. Always normalise to the T=0 image from the same well position to account for variation in scratch width.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">Which FBS grade is best for scratch assays?<\/div>\n <p class=\"faq-a\">For standard cell culture and routine assays: <strong>FBS Standard<\/strong> at 10% for expansion and 1\u20132% during migration. For drug or cytokine screening: <strong>FBS Low Endotoxin (<1 EU\/mL)<\/strong> to prevent LPS from masking treatment effects. For assays involving antibody-based readouts: <strong>FBS Low IgG<\/strong>. Batch reservation is recommended for all longitudinal studies \u2014 migration behaviour is sensitive to lot-to-lot variation in growth factor content.<\/p>\n<\/div>\n\n<div class=\"faq-item\">\n <div class=\"faq-q\">Can I use the scratch assay in 96-well plates?<\/div>\n <p class=\"faq-a\">Yes \u2014 commercial wound-making tools (e.g. WoundMaker, Essen BioScience) create standardised, reproducible scratches in 96-well plates, enabling high-throughput compound screening. This format is best paired with an automated live-cell imager for continuous monitoring without well disturbance.<\/p>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n RELATED APPLICATIONS & PRODUCTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"related-box\">\n <h3 class=\"related-title\">Related Applications & Products<\/h3>\n <div class=\"related-grid\">\n <a href=\"https:\/\/seamlessbio.de\/applications\/live-cell-monitoring\/\" class=\"related-link\">\u2192 Live Cell Monitoring \u2014 zenCELL owl Full Guide<\/a>\n <a href=\"https:\/\/seamlessbio.de\/products\/fetal-bovine-serum\/\" class=\"related-link\">\u2192 FBS Portfolio \u2014 All Grades & Specifications<\/a>\n <a href=\"https:\/\/seamlessbio.de\/applications\/cytotoxicity-assays\/\" class=\"related-link\">\u2192 Cytotoxicity Assays \u2014 Serum Guide<\/a>\n <a href=\"https:\/\/seamlessbio.de\/products\/bsa\/\" class=\"related-link\">\u2192 BSA \u2014 Bovine Serum Albumin<\/a>\n <a href=\"https:\/\/www.zencellowl.com\" target=\"_blank\" rel=\"noopener\" class=\"related-link\">\u2192 zenCELL owl Website<\/a>\n <a href=\"https:\/\/seamlessbio.de\/products\/fbs-low-endotoxin\/\" class=\"related-link\">\u2192 FBS Low Endotoxin \u2014 Drug Screening Grade<\/a>\n <\/div>\n<\/div>\n\n<div class=\"back-link-wrap\">\n <a href=\"https:\/\/seamlessbio.de\/applications\/\" class=\"back-link\">\u2190 All Application Guides Overview<\/a>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n CTA\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"cta-box\">\n <h2 class=\"cta-title\">zenCELL owl Demo + FBS Sample Bundle<\/h2>\n <p class=\"cta-text\">Request a zenCELL owl demo for your scratch assay workflow. Exclusive bundle: zenCELL owl demo + FBS sample set for protocol setup. Free FBS test volumes included.<\/p>\n <p class=\"cta-contact\">Email: info@seamlessbio.de | +49 851 37932226 | <a href=\"https:\/\/www.zencellowl.com\" target=\"_blank\" rel=\"noopener\">zencellowl.com<\/a><\/p>\n <div class=\"cta-buttons\">\n <a href=\"https:\/\/seamlessbio.de\/contact\/\" class=\"cta-btn-primary\">REQUEST DEMO<\/a>\n <a href=\"https:\/\/seamlessbio.de\/products\/fetal-bovine-serum\/\" class=\"cta-btn-outline\">FBS PORTFOLIO \u2192<\/a>\n <\/div>\n<\/div>\n\n<\/body>\n<\/html>\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Migration Scratch Assay \u2014 Complete Protocol & Optimization Guide | SeamlessBio Application Guide \u00b7 Cell Migration Migration Scratch Assay \u2014 Complete Protocol & Optimization Guide Everything you need to run […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","footnotes":""},"class_list":["post-893","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Migration Scratch Assay \u2014 Protocol & Guide | SeamlessBio<\/title>\n<meta name=\"description\" content=\"Complete scratch assay protocol: serum strategy, critical parameters, quantification, and live cell imaging. 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