Dear experts,

We bought Salmonella typhimurium TA102 from ATCC for Ames test. Upon checking its genetic analysis, turned out it is histidine independent which I was expecting histidine dependence. Basically, the TA102 has growth on GMA and GMA supplemented biotin only agar. We conducted the genetic check for 3 times and had same results.

Does anyone know how to troubleshoot the problem or has an idea on this issue?

Thanks!!

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