3NHH:
reference: Structural and thermodynamic consequences of burial of an artificial ion pair in the hydrophobic interior of a protein., Robinson AC, Castaneda CA, Schlessman JL, Garcia-Moreno E B, Proc Natl Acad Sci U S A. 2014 Aug 12;111(32):11685-90. doi:, 10.1073/pnas.1402900111. Epub 2014 Jul 29. PMID: 25074910

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