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Correlations between myofilament phosphorylation, sex hormones, and cardiomyocyte function. (A) Strong correlation between myosin-binding protein C (MyBP-C) phosphorylation and cardiomyocyte Factive (r = 0.986, P < 0.05). (B) Calcium sensitivity of force production (pCa50) inversely correlated with serum progesterone levels (r = 0.963, P < 0.05). Correlation was assessed by fitting the values by a linear regression.
