A 99% purity figure tells you nothing about endotoxin load — and that blind spot is one of the quietest causes of irreproducible cell-culture and in-vitro research. Here is why the bacterial endotoxin test deserves a place on every certificate of analysis.
A vial without a Certificate of Analysis is a guess wearing a label. A COA is how “trust me” becomes “here are the numbers” — if you know how to read it. A practical, evergreen field guide for reproducible Research Use Only work.
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