1P4I:
reference: Directed in Vitro Evolution and Crystallographic Analysis of a Peptide-binding Single Chain Antibody Fragment (scFv) with Low Picomolar Affinity., Zahnd C, Spinelli S, Luginbuhl B, Amstutz P, Cambillau C, Pluckthun A, J Biol Chem 2004 Apr 30;279(18):18870-7. Epub 2004 Jan 30. PMID: 14754898

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