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Polymers based on natural amino acids with cysteine for linking. Structures of oligomers (sequences from N→C-terminus) that are able to form bioreducible linkages by dimerization [CWK18 (68)], in a linear [II Cys (68), CK10C (87), His 6 (88)], or cross-linking [III-V Cys (68)] way. C, cysteine; W, tryptophane; K, lysine; H, histidine.
