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The early published ideas about the arrangements of myosin heads on myosin filaments in a vertebrate smooth muscle (Small and Squire 1972), b frog sartorius muscle (Huxley and Brown 1967) and c insect (Lethocerus) flight muscle (Reedy 1968). The marked differences in the way that the myosin molecules would have to pack to make these structures prompted Squire (1971) to propose an alternative set of structures for (b) and (c)
