KIT and myocardial infarction: To examine the in vivo protective effect of BK on hCPCs in MI, we transplanted the BK-pre-treated CPCs into MI rats and explored the effect of BK-pre-treated hCPCs on MI cardiac function, inflammation, and cardiac fibrosis; c-kit-negative cardiomyocytes (CPC- cells) and PBS-treated-hCPCs were employed as the control cells.