AIF1 and Stroke: The proportion of these cells that were also immunopositive for Iba1 in our study (38 ± 8% within the first 250 μm from the infarct when averaged over all rats) is similar to numbers of Iba1-positive proliferating cells detected using bromodeoxyuridine labelling at 3 to 4 days after photothrombotic stroke in rats [12] or temporary middle cerebral artery occlusion in mice [19].