2RLN:
reference: Thermodynamic and structural consequences of changing a sulfur atom to a methylene group in the M13Nle mutation in ribonuclease-S., Thomson J, Ratnaparkhi GS, Varadarajan R, Sturtevant JM, Richards FM, Biochemistry 1994 Jul 19;33(28):8587-93. PMID: 8031793

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