PDGFRB and glioblastoma: Despite the low relative abundance of pericytes within the GBM microenvironment, spatial expression analysis of the mural cell marker genes PDGFRβ and ACTA2 in a human spatial transcriptomics GBM dataset (Fig. S1D) demonstrated the strategic positioning of pericytes in close proximity to blood vessels with easy access to the malignant parenchyma.