2YCF:
reference: Structural characterization of inhibitor complexes with checkpoint kinase 2 (Chk2), a drug target for cancer therapy., Lountos GT, Jobson AG, Tropea JE, Self CR, Zhang G, Pommier Y, Shoemaker RH, Waugh DS, J Struct Biol. 2011 Dec;176(3):292-301. Epub 2011 Sep 22. PMID: 21963792

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