Overexpression of extracellular HMGB1 was observed in several neuroinflammatory conditions, including TBI [12], Subarachnoid hemorrhage (SAH) [13], Epilepsy [14], Alzheimer’s diseases (AD) [15], Amyotrophic lateral sclerosis (ALS) [16,17] Parkinson’s diseases (PD) [18], etc. The gene discussed is HMGB1; the disease is subarachnoid hemorrhage.