One of the mysteries of the English language finally explained.
Any 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).
1940s; earliest use found in Journal of Clinical Investigation. From myo- + filament.
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