1B5U:
reference: Contribution of hydrogen bonds to the conformational stability of human lysozyme: calorimetry and X-ray analysis of six Ser --> Ala mutants., Takano K, Yamagata Y, Kubota M, Funahashi J, Fujii S, Yutani K, Biochemistry 1999 May 18;38(20):6623-9. PMID: 10350481

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