The percentage of apoptotic CD4+ T cells, CD8+ T cells, B cells, and NK cells were comparable in sham‐operated and tMCAO‐induced mice (Figure 5G‐J), suggesting that unlike other tissues, ischemic stroke leads to a significant loss of lymphocytes in the lungs but it is unrelated to the induction of apoptosis. This evidence concerns the gene CD4 and ischemic stroke.