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Mechanical model of the myosin head. M1-M4, domains of the central region; CO, converter region with the mechanical gear; L, lever arm; PB, phosphate-binding pocket; C1, 50-kDa cleft; C2, ATPase cleft; C3, SH cleft; PT, piston attracting the phosphate group of ATP; HE, helix linking the phosphate group to M1; E1, E2, elastic elements.
