OLIG2 and neoplasm: Labeling tumor sections with OLIG2 and SOX10 antibodies (Fig. 3a) demonstrated both OLIG2+/SOX10+ cells that we considered to be oligodendrocytes and OLIG2+/SOX10− cells that we considered to be OLIG2-expressing tumor stem cells, equivalent to the Olig2+ cells of clusters 1, 2, and 7.