Ischemia increases cell proliferation in the dentate gyrus of adult gerbils. Animals were subjected to 10 min of global ischemia. BrdU was administered 1 d before the animal was killed, and brains were processed for BrdU immunohistochemistry.A, Control untreated gerbil. B–F, Ischemic gerbils killed 8 d (B), 2 weeks (C), 3 weeks (D), 4 weeks (E), or 5 weeks (F) after ischemia. Scale bar, 250 μm.