Human Cell Authentication Testing Service Short Tandem Repeat profiling, or STR profiling, is a rapid, reproducible and standardized PCR-based method for the unambiguous identification or authentication of human cell lines with resolution down to the individual donor. Mycoplasma Testing Testing cell cultures for mycoplasma is essential to ensure reliable research and biotechnology products. Mycoplasma contamination does not produce turbidity but can have adverse effects on cell line growth and characteristics.