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a Upregulated NOS activity was found in woodchuck myocardium in winter, *p <0.05. b Western blot analysis of iNOS. There is no change in the level of iNOS in woodchucks in winter vs. summer. c–d Western blot analysis of eNOS and its phosphorylated form (Ser1177). Both are significantly elevated in woodchucks in winter (n = 5). *p <0.05 vs. summer (n = 5). GAPDH was used as a loading control. Values are presented as mean ± SEM
