PROM1 and glioblastoma: To further characterize the population of 313 malignant non-cycling PROM1+ cells from pediatric glioblastomas, we compared their expression levels with 548 non-cycling PROM1- cells (Fig. 1f, upper panel, Supplementary Data 1), and with 523 cycling PROM1+ cells (Fig. 1f lower panel, Supplementary Data 2) and we identified specific sets of marker genes (Fig. 1g).