HLA-C and infection: To convert human ESCs into SkM cells, we added SeV‐Myod1 to human ESCs once on day 0 or twice on days 0 and 2 (Figure 1A), and we compared the positivity of myosin heavy chain (MHC), one of the SkM markers, among different conditions of SeV‐Myod1 infection (Figure 1C).