ITGAM and ischemia: MRC-1 (CD-206 gene) and Arg-1 were previously reported to be present three days after ischemia in perivascular microglial/macrophages in leptomeninges from where they entered the neocortex along the penetrating arterioles in the peri-infarct [10], suggesting that these cells may be absent from our CD11b+-microglia population obtained after brain perfusion and dissociation.