4IQY:
reference: A family of macrodomain proteins reverses cellular mono-ADP-ribosylation., Jankevicius G, Hassler M, Golia B, Rybin V, Zacharias M, Timinszky G, Ladurner AG, Nat Struct Mol Biol. 2013 Apr;20(4):508-14. doi: 10.1038/nsmb.2523. Epub 2013 Mar, 10. PMID: 23474712

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