MYC and leukemia: Studies on HTLV1, the most common human leukemia virus, and murine leukemia virus (MuLV), commonly used in constructing mouse models in experiments, have shown that genes related to T cell development, in particular, ETS1, ELF1, SRF, and MYC, display functional abnormalities driven by viral enhancers upon T cell infection by the virus [59, 60].