2WW6:
reference: Structural characterization of a beta-turn mimic within a protein-protein interface., Eckhardt B, Grosse W, Essen LO, Geyer A, Proc Natl Acad Sci U S A. 2010 Oct 26;107(43):18336-41. Epub 2010 Oct 11. PMID: 20937907

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