3GJN:
reference: Following evolutionary paths to protein-protein interactions with high affinity and selectivity., Levin KB, Dym O, Albeck S, Magdassi S, Keeble AH, Kleanthous C, Tawfik DS, Nat Struct Mol Biol. 2009 Oct;16(10):1049-55. Epub 2009 Sep 13. PMID: 19749752

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