Analysis of coronal sections across the tumor-bearing brain showed that a majority of IL-33-positive cells (≥80%) also co-express OLIG2, and more than half (around 60%) co-express CNPase (Figure 2F) while co-labeling with GFAP is seen in 5% of the IL-33-positive cells (Figure 2F). The gene discussed is OLIG2; the disease is neoplasm.