Forkhead box M1 (foxm1), a transcription factor, was significantly increased at 3 dpa and was deemed a candidate for injury-induced cardiomyocyte proliferation based on its known role in driving proliferation in cancer (Kalin et al., 2006; Kim et al., 2006; Madureira et al., 2006; Wang et al., 2008). Here, FOXM1 is linked to cancer.