1WQM:
reference: Contribution of hydrogen bonds to the conformational stability of human lysozyme: calorimetry and X-ray analysis of six tyrosine --> phenylalanine mutants., Yamagata Y, Kubota M, Sumikawa Y, Funahashi J, Takano K, Fujii S, Yutani K, Biochemistry 1998 Jun 30;37(26):9355-62. PMID: 9649316

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