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PD-L1 grants AMs high CTL suppression ability. (A) PD-L1-dependent repression of CD8+ T-cell activity by AMs (n ≥ 4). (B) PD-L1-dependent decrease of CD8+ T cells by AMs (n ≥ 4). Student’s t test was performed (two tailed, unpaired) and data represent means ± SEM. **P < 0.01.
