Upregulation of forkhead box 1 (Fox1) Fox2, FGF1/p38 MAP kinase inhibitor, cyclin-dependent kinase 1 (CDK1), CDK4, cyclin B1, D1, D2, and Meis1 extends the postnatal CM proliferative window and promotes cardiac regeneration in adult post-MI heart [16,17,18,19,20]. Here, CDK1 is linked to myocardial infarction.