The use of good cell culture practices all but eliminates the risk of inadvertent contamination of the cell line of interest with another cell line. ChemoScreen has confirmed the identity of each chemo-resistant cell line in its catalog. For clients using ChemoScreen's cell line development service, samples of the developing cell line are cryoppreserved and authenticated on a monthly basis to mitigate against cell line cross-contamination. ChemoScreen has not experienced cross-contamination of one cell line with another.