Out of the microglial population, 25.6 % ± 2.5 of the GAL-3+ cells, 49 % ± 4.5 of CD11b+ cells and only 16 % ± 11.7 of IBA1+ cells were positive for GFP at 7 days after stroke suggesting that only a limited number of microglia were derived from pericytes. The gene discussed is AIF1; the disease is stroke disorder.