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The Asx turnis a structural feature in proteins and polypeptides. It consists of three amino acid residues in which residue i is an aspartate or asparagine that forms a hydrogen bond from its sidechain CO group to the mainchain NH group of residue i+2. About 14% of Asx residues present in proteins belong to Asx turns.
The name "Asx" is used here to represent either of the amino acids aspartate or asparagine.
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