In the past, the heart muscle was thought to originate from a single source of myocardial progenitor cells. More recently, however, an additional source of myocardial progenitors has been revealed to
Normal-mutant pairs (8–10) of littermates from 8 litters were analyzed for apoptosis by TUNEL assay and for cell proliferation by phospho-Histone3 immunohistochemistry as described in the Methods sect
