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fibril (fi´bril) a minute filament, such as a component of a fiber. adj., fi´brillar, fi´brillary, adj. . collagen fibrils
delicate fibrils of collagen in connective tissue, composed of molecules of tropocollagen in linear array. In Type I collagen, the most common type, the tropocollagen molecules are associated in periodic, staggered arrays that give the appearance of cross-banding, forming unit fibrils; these
unit fibrils are aggregated in bundles to form larger fibrils, with longitudinal striations, which may themselves be aggregated
into fibers. muscle fibril
myofibril. nerve fibril
neurofibril.
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