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A protein which is the chief constituent of silk.
- ‘As water volume decreased and the concentration of fibroin increased, the proteins folded in on themselves, forming round structures called micelles.’
- ‘Molecular elasticity is associated with a select number of polypeptides and proteins, such as titin, Lustrin A, silk fibroin, and spider silk dragline protein.’
- ‘The mechanisms are not well defined, but iron and tin will promote the photo-oxidation of the silk fibroin.’
- ‘The raw silk fiber actually consists of two filaments called fibroin bound by a soluble silk gum called sericin.’
- ‘A molecule of capture fibroin is made of the same two components but in very different proportions: it consists almost entirely of tangles, with very few microcrystals.’
Mid 19th century: from fibro- + -in.
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