Tumors were diffusely infiltrative, and GFP+ tumor cells clearly colocalized with H3K27M and Ki-67 and expressed high levels of neural stem/progenitor cell markers OLIG2 and Nestin (Fig. 2C; Supplementary Figs. S10A and S10B; S11A and S11B; S12A and S12B; S13A and S13B; S14; and S15). The gene discussed is OLIG2; the disease is neoplasm.