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- Dictionaryfibril/ˈfʌɪbr(ɪ)l/
noun
- 1. a small or slender fibre: technical "each muscle fibre is subdivided into smaller fibrils"
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noun
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Fibrils are structural biological materials found in nearly all living organisms. Not to be confused with fibers or filaments, fibrils tend to have diameters ranging from 10 to 100 nanometers (whereas fibers are micro to milli-scale structures and filaments have diameters approximately 10–50 nanometers in size). Fibrils are not usually found alone but rather are parts of greater hierarchical struc... Wikipedia