Why Tet-Free serum matters for inducible expression

Standard fetal bovine serum can contain trace levels of tetracycline or related compounds, originating from veterinary use in source herds. For most cell culture applications this is irrelevant — but for experiments relying on tetracycline-inducible (Tet-On / Tet-Off) expression systems, even trace contamination can cause unintended, low-level activation or leakiness of the inducible promoter, confounding experimental results.

SeamlessBio FBS Tet-Free is screened specifically to confirm the absence of tetracycline and its derivatives, providing a clean baseline for experiments where inducible system control is essential to data interpretation.