2PNB:
reference: Structure of an SH2 domain of the p85 alpha subunit of phosphatidylinositol-3-OH kinase., Booker GW, Breeze AL, Downing AK, Panayotou G, Gout I, Waterfield MD, Campbell ID, Nature 1992 Aug 20;358(6388):684-7. PMID: 1323062

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