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noun
Biology PhysiologyAny of the ultramicroscopic, rod-like aggregates of protein molecules that are arranged in an overlapping array in the sarcomere of a myofibril, occurring in two forms, the thick filament (composed of myosin molecules) and thin filament (composed of actin molecules).
Origin
1940s; earliest use found in Journal of Clinical Investigation. From myo- + filament.
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