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Relative νmax (normalized to νmax at 0 mM MgADP) at increasing concentrations of MgADP at 100% and 25% phosphorylation for phasic (A) and tonic smooth muscle myosin (B). The slopes of the regression lines were not significantly different between 100% and 25% phosphorylation for phasic muscle myosin but were significantly different for tonic muscle myosin (P > 0.001).
