CD8 T cells of Stx11^−/− mice express inhibitory receptors.Stx11^+/− (○) and Stx11^−/− (●) mice were infected intravenously with 200 PFU LCMV. After gating on CD8 T cells, GP33-specific cells were phenotyped for expression of inhibitory receptors PD-1, LAG-3, 2B4, and CD160. Inserted numbers indicate percentages of H-2D^b GP33-tetramer-positive CD8 T cells, which express the respective exhaustion marker. FACS illustrations are representative for the mouse groups; graphs represent data for individual mice. Horizontal lines in graphs represent mean values. Data (mean ± SEM) represent 2 independent experiments with 2 or 3 mice per group. *P < .05 (Student unpaired t test). **P < .005 (Student unpaired t test). ***P < .001 (Student unpaired t test).