CD8A and neoplasm: MACS-CD8+ TILs were analyzed for polyfunctional reactivity against B16 tumor cells (Figure 4A), flow-sorted B16-associated NG2+CD31negPDGFRB+CD45neg pericytes + NG2negCD31+PDGFRBnegCD45neg VECs (PVEC; Figure 4B), or (antigenically) irrelevant EL4 thymoma cells (Figure S4).