Cardiomyocyte proliferation during EAM. In adult mammal hearts, cardiomyoctyes do not proliferate following damage such as that caused by myocardial infarction. However, in some mammals, cardiomyocyte proliferation occurs. “Neonatal cardiomyocytes proliferate, and the cardiomyocytes of zebrafish proliferate through adulthood,” says Osaka University Professor Yasushi Fujio. However, hearts recover well from myocarditis, suggesting adult cardiomyocytes can proliferate...