1CKH:
reference: Contribution of intra- and intermolecular hydrogen bonds to the conformational stability of human lysozyme(,)., Takano K, Yamagata Y, Funahashi J, Hioki Y, Kuramitsu S, Yutani K, Biochemistry 1999 Sep 28;38(39):12698-708. PMID: 10504240

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