2GD7:
reference: Structure of the Cyclin T binding domain of Hexim1 and molecular basis for its recognition of P-TEFb., Dames SA, Schonichen A, Schulte A, Barboric M, Peterlin BM, Grzesiek S, Geyer M, Proc Natl Acad Sci U S A. 2007 Sep 4;104(36):14312-7. Epub 2007 Aug 27. PMID: 17724342

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