The brain samples were collected at 24 hours after SAH. Western blotting was performed as described previously18 (link). Primary antibodies used were: MFGE8 (Santa Cruz Biotechnology), HO-1, Nrf2 (Santa Cruz Biotechnology), 4-Hydroxynonenal (4-HNE, Abcam Biotech Company), Nitrotyrosine (Santa Cruz Biotechnology), integrin β3, extracellular-signal-regulated kinase (ERK) and phosphorylated ERK (p-ERK).