1FU6:
reference: NMR structure of the N-SH2 of the p85 subunit of phosphoinositide 3-kinase complexed to a doubly phosphorylated peptide reveals a second phosphotyrosine binding site., Weber T, Schaffhausen B, Liu Y, Gunther UL, Biochemistry 2000 Dec 26;39(51):15860-9. PMID: 11123912

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