2JM9:
reference: The high-resolution NMR structure of the R21A Spc-SH3:P41 complex: understanding the determinants of binding affinity by comparison with Abl-SH3., Casares S, Ab E, Eshuis H, Lopez-Mayorga O, van Nuland NA, Conejero-Lara F, BMC Struct Biol. 2007 Apr 2;7:22. PMID: 17407569

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