CD4 and myocardial infarction: Moreover, there was no difference in infiltration of macrophages (CD45+F4/80+CD11b+), T cells (CD45+CD3+), T‐helper cells (CD45+CD3+CD4+), or cytotoxic T cells (CD45+CD3+CD8+) in both ATM+/+ and ATM+/− mouse hearts post MI.