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Changes in the expression of PD-1 in CD8+ T-cells and their subsets before (black bars) and after (white bars) MOD (panel A) and HIIE (panel B). Values are means ± standard error. ∗ indicates a significant difference relative to Pre-Ex: ∗p < 0.05. # indicates significantly higher expression levels in memory T-cells subsets, compared to naïve and TEMRA: ###p < 0.0001.
