3KT9:
reference: CK2 phosphorylation-dependent interaction between aprataxin and MDC1 in the DNA damage response., Becherel OJ, Jakob B, Cherry AL, Gueven N, Fusser M, Kijas AW, Peng C, Katyal S, McKinnon PJ, Chen J, Epe B, Smerdon SJ, Taucher-Scholz G, Lavin MF, Nucleic Acids Res. 2009 Dec 14. PMID: 20008512

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