“…Globally, cell cycle-related genes, such as CDK1 and AURKB , are downregulated in the adult, while structural and metabolic genes, such as MYOM2 and CD36 , are upregulated in the adult compared with fetal and in vitro CMs ( Figure 1 E). Similarly, several MAPK genes, such as MAP2K6 and MAP3K1 , or upstream activators of the pathway, such as FGF13 ( Lin et al., 2019 ) and IGF2BP3 ( Suvasini et al., 2011 ), show significant downregulation postnatally. Meanwhile, negative regulators, such as the dual-specificity phosphatases DUSP1 and DUSP6 ( Owens and Keyse, 2007 ), are significantly upregulated in the adult compared with fetal and in vitro CMs ( Figure 1 E).…”