PDGFRα was also highly coexpressed by the ASCL1+ (Figure 4k) and OLIG2+ (not shown) tumor cells, whereas GFAP and to a lesser extent S100β and NEUN, although found in some parts of the tumor, did not overlap significantly with SOX2 or ASCL1 (Figure 4l–n). The gene discussed is ASCL1; the disease is neoplasm.