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Wikipedia definition
1. Collagen helixIn collagen, the collagen helix, or type-2 helix, is a major shape in secondary structure. It consists of a triple helix made of the repetitious amino acid sequence glycine - X - Y, where X and Y are frequently proline or hydroxyproline. Each of the three chains is stabilized by the steric repulsion due to the pyrrolidine rings of proline and hydroxyproline residues.
Read “Collagen helix” on English Wikipedia
Read “コラーゲンヘリックス” on Japanese Wikipedia
Read “Collagen helix” on DBpedia

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