TGFB2 and glioblastoma: However, the results of qPCR assays revealed that Ki67 mRNA was highly expressed in CAR-T cells (Fig. S1F), and the results of Western blotting assays indicated stable expression of the TGF-β2 protein in CAR-T cells, although its expression level was lower in these cells than in GBM cells (Fig. S1G).