KERATIN 9
\kˈɛɹɐtˌɪn nˈa͡ɪn], \kˈɛɹɐtˌɪn nˈaɪn], \k_ˈɛ_ɹ_ɐ_t_ˌɪ_n n_ˈaɪ_n]\
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A class of fibrous proteins or scleroproteins important both as structural proteins and as keys to the study of protein conformation. The family represents the principal constituent of epidermis, hair, nails, horny tissues, and the organic matrix of tooth enamel. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms an alpha-helix, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure.
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Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.