KIT and myocardial infarction: Since cKit BMCs could not regenerate heart, cultured Lin-cKit+ cardiac progenitor cells, however, showed initially a positive response to regenerate 70% of adult rodent hearts after MI injury.11 This study was also not confirmed in adult hearts.19 Uchida et al20 reported Sca1-derived cells as a source of myocardial renewal in the murine adult heart.