Collagenase and autologous blood injection ICH models were performed as described previously.3 (link), 10 (link), 17 (link) Briefly, under isoflurane anesthesia, 0.5 μl of 0.2 U type VII-S collagenase (Sigma-Aldrich) or 25 μl autologous blood was injected into the right striatum at the following coordinates relative to bregma: 2.5 mm lateral, and 3.0 mm deep at 5 ° angle. The rectal temperature was maintained at 37.0 ± 0.5 °C throughout the surgery and recovery periods.