MRTFA and Merkel cell skin cancer: The results essentially point to one cell line (MCC14/2) growing in all three types of raft, and the WAGA, MS-1, and MKL-1 MCPyV+ MCC cells and the MCC13 and MCC26 MCPyV− MCC cells only growing when mixed with the PHK cells in the epithelial layer (Table 1).