4XYA:
reference: 9H-Purine Scaffold Reveals Induced-Fit Pocket Plasticity of the BRD9 Bromodomain., Picaud S, Strocchia M, Terracciano S, Lauro G, Mendez J, Daniels DL, Riccio R, Bifulco G, Bruno I, Filippakopoulos P, J Med Chem. 2015 Mar 5. PMID: 25703523

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