4GB0:
reference: Structural basis for role of ring finger protein RNF168 RING domain., Zhang X, Chen J, Wu M, Wu H, Arokiaraj AW, Wang C, Zhang W, Tao Y, Huen MS, Zang J, Cell Cycle. 2013 Jan 15;12(2):312-21. doi: 10.4161/cc.23104. Epub 2012 Jan 15. PMID: 23255131

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