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A2A-ARs protect atria against hypoxic injury. (A) Representative original tracing of a WT left atrium during first hypoxia and re-oxygenation are shown in order to visualize the experimental protocol. (B) Force of contraction at the end of the hypoxia re-oxygenation cycle is presented. #p < 0.05 vs. Ctr, ★p < 0.05 vs. WT
