Using scRNAseq data from patient samples of primary and recurrent GBM (GSE154975) (17), we identified multiple cell types based on markers from the original study: macrophages (ITGAM), T cells (CD3E), Tregs (CD4, CD3E, FOXP3), low-reads/dying cells (MALAT1), and tumor/normal brain cells (GFAP, SOX2; Figures S2B and Figure 2E). Here, SOX2 is linked to glioblastoma.