3F4Z:
reference: Structural and biological mimicry of protein surface recognition by {alpha}/{beta}-peptide foldamers., Horne WS, Johnson LM, Ketas TJ, Klasse PJ, Lu M, Moore JP, Gellman SH, Proc Natl Acad Sci U S A. 2009 Aug 17. PMID: 19706443

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