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Understanding the protein secondary structures and physics of IR interaction. (A) Parallel β-pleated sheet structure of proteins. N-H groups in the backbone of one strand form hydrogen bonds with the C=O groups in the backbone of the adjacent strand to form a β-sheet. (B) Right-handed α-helix structures of proteins. The backbone N-H group donates a hydrogen bond to the backbone C=O group, contributing to the helical structure of the α-helix.
