1QAD:
reference: Crystal structure of the C-terminal SH2 domain of the p85alpha regulatory subunit of phosphoinositide 3-kinase: an SH2 domain mimicking its own substrate., Hoedemaeker FJ, Siegal G, Roe SM, Driscoll PC, Abrahams JP, J Mol Biol 1999 Oct 1;292(4):763-70. PMID: 10525402

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