= Protein secondary structure
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<Protein secondary structure> consists of recurring local arrangements of the <protein backbone>, notably the <alpha helix> and <beta sheet>. <Backbone hydrogen bonds> help stabilize these patterns. A <beta sheet> can bring together stretches far apart in the <protein primary structure>; local refers to the pattern of backbone geometry, not necessarily neighboring sequence positions. See https://www.ncbi.nlm.nih.gov/books/NBK26830/[Alberts et al.: alpha helices, beta sheets and backbone interactions].
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