This was consistent with the small fraction of Aldh1l1 positive cells that labeled for BrdU+ (8.5±1.2% for day 2; 11.1±1.2% cumulatively for days 2–6), and by the small percentage of BrdU+ cells that were also positive for Aldh1l1 (6.4±1.4% for day 2; 8.7±0.6% for days 2–6), suggesting that mature astrocytes do not proliferate extensively after stroke, and that proliferation happens early. The gene discussed is ALDH1L1; the disease is Stroke.