Abstract
The sites of calcium-activated myosin ATP-ase reaction have been determined by a method modified from that of Padykula and Hermann. On coherent muscle preparations the enzyme was found to be mainly active in the segment A, although reaction was sometimes observed in the strip Z also. In several cases the precipitate appeared in a spherical shape in the segment A. Since no such phenomenon was observed in isolated bundles of myofibrils it is supposed to be an artefact. The reaction appeared in fibre bundles at 300 to 400 A intervals, and a certain spatial periodicity was observed also on isolated thick filaments.
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