CIITA and neoplasm: Consistent with the results at 21 days post tumor cell injection, nestin was strongly expressed on both GL261-CIITA tumor cells and GL261 parental tumor and in peritumoral astrocytes in pre-vaccinated and non-vaccinated mice, respectively (Figures 5, 6; compare pre-vaccinated, tum CIITA, to non-vaccinated, tum WT).