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. 2020 Aug 5;44:107607. doi: 10.1016/j.biotechadv.2020.107607

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Fig. 2 — Bonds in keratin structures. (a) Intrachain bonds, interchain bonds and intermediate filaments (IFs) bonding in keratin-associated proteins (KAPs) matrix; (b) The formation of disulfide bonds (cysteine-cysteine), hydrogen bonds (e.g. glutamine-serine) and ionic bonds (e.g. aspartic acid-lysine) in protein.