Fig. 5

PD-1 expression on bT_RM cells following MCMV infection. PD-1 expression was evaluated on both CD103⁺ and CD103⁻ T cell populations within the MCMV-infected brains of WT, PD-L1 KO, and PD-1 KO mice at 30 dpi. a Flow cytometric plots illustrate expression of PD-1 and CD103 on CD8⁺ T cells and are representative of two separate experiments using 3–4 animals/group at 30 dpi. b Data are represented as mean ± SD percentage of CD8⁺ T cells which were PD-1⁺CD103⁺ and PD-1⁺CD103⁻ among WT and PD-1L KO animals at 30 dpi. **p < 0.001 WT versus PD-1 KO for PD-1⁺CD103⁺ at 30 dpi