PROM1 and glioblastoma: Interestingly, only H2AZ2 (but not H2AZ1) expression rigorously correlated with GSCs as (1) its expression was higher in GSCs (CD133+ or Nestinhigh) than non-GSCs (CD133− or Nestinlow) (Supplementary Fig. S1H, I); and its expression was significantly higher in GSCs than bulk GBM tumors (Supplementary Fig. S1J).