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Sex differences in muscles in myosin heavy chain proportions (a), and basal expression of proteins involved in calcium handling (b), redox regulation (c), and muscle metabolism and O2 transport (d). n = 43; 30 M and 13 F, except for SOD1 and SOD2 with n = 42. Males: blue circles; females: red triangles. The values shown are means ± standard errors and expressed in arbitrary units (a.u.). * P < 0.05 for between-sex differences.
