This is the first of 4 videos dealing exclusively with cell potency. The second video in the series answers many questions about different aspects of cell potency. The third video will describe how an in-house potency reference standard can be established and the final video will demonstrate how stem cell potency is actually measured using cord blood as an example. The assays discussed in these videos are all available through our partner company, Preferred Cell Systems. Please visit their website for additional information: www.preferred-cell-systems.com.