Representative Western blots and band density for Kir6.2 from male and female hearts. A, Kir6.2 protein from Sed male (M, n = 4) and Sed female (F, n = 4) hearts. Data are expressed as a function of Sed male (*P < 0.05 versus Sed male) band density. B, myocardial Kir6.2 protein from male rats exposed to 0 (Sed, n = 4), 1 (n = 5) or 5 (n = 5) days of exercise (†P < 0.1 versus Sed male). C, myocardial Kir6.2 protein from female rats exposed to 0 (Sed, n = 4), 1 (n = 5) or 5 (n = 5) days of exercise.