CD69 and infection: On day 60 post‐infection, OT‐I cells within the brain were primarily CD69+CD103−KLRG‐1− and CD62L−, whereas OT‐I cells within the lung were CD69–CD103–KLRG‐1+ and CD62L− and OT‐I cells within the spleen were predominantly CD69–CD103−KLRG‐1− and CD62L+ (Figure 2c–f).