4ZNC:
reference: Suppression of conformational heterogeneity at a protein-protein interface., Deis LN, Wu Q, Wang Y, Qi Y, Daniels KG, Zhou P, Oas TG, Proc Natl Acad Sci U S A. 2015 Jul 21;112(29):9028-33. doi:, 10.1073/pnas.1424724112. Epub 2015 Jul 8. PMID: 26157136

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