Microglia conditioned with mGICPten−/−;p53−/−‐CM or GL261‐CM showed a significant increase in phosphorylation at both of these sites (Figs 2B and D, and EV1A), when compared to cultures treated with mNSC‐CM or unconditioned media, supporting the notion that the phenotype is consistent across glioblastoma models. This evidence concerns the gene TP53 and glioblastoma.