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Effect of chronic intermittent hypobaric hypoxia (IHH, black columns) on protein expression of Cx43 upstream protein kinases: protein kinase A (PKA) (A), protein kinase G (PKG) (B), and casein-kinase 1 (CK1) (C) assessed by western blotting in left ventricular myocardium. N, normoxic group (open columns). Values are mean ± SEM, (n = 5 in each group), **P < 0.01.
