3I5R:
reference: Structural studies of the phosphatidylinositol 3-kinase (PI3K) SH3 domain in complex with a peptide ligand: role of the anchor residue in ligand binding., Batra-Safferling R, Granzin J, Modder S, Hoffmann S, Willbold D, Biol Chem. 2010 Jan;391(1):33-42. PMID: 19919182

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