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Figure 2 A, Relation between functional capacity (VO2max) and iNOS expression in skeletal muscle of patients with chronic heart failure (closed circles) and healthy normals (open circles). B, Relation between the relative amount of mi-CK and iNOS expression as determined by % positive tissue area in skeletal muscle of patients with chronic heart failure (closed circles) and healthy normals (open circles). Note the hyperbolic correlation.