The analysis of this series of early passage human melanoma lines has shown them to be highly heterogeneous not only with respect to expression of proteins directly associated with EMT such as E-cadherin, Snail, Slug, and Axl (Figure 1) but also with respect to expression of proteins that are more indirectly associated with EMT, such as MITF and p53 (Figure 3). The gene discussed is SNAI1; the disease is melanoma.