To examine if apoptosis plays a major role in SARS-CoV-2 infected iPSC-CM, we performed TUNEL staining (Fig. 2F) on fixed cells 24 h post-infection and also checked for expression of procaspase 3 and cleaved caspase 3 in protein lysates from uninfected and infected samples (Fig. 2G). The gene discussed is CASP3; the disease is infection.