RBFOX2 and glioblastoma: FBXO7 upregulation in mesenchymal glioblastoma stabilizes Rbfox2 through K63‐linked ubiquitination after its arginine dimethylation by PRMT5, and thus controls Rbfox2‐mediated splicing of mesenchymal genes, resulting in glioblastoma stem cell self‐renewal, mesenchymal transformation, and chemoresistance.