2BFQ:
reference: The macro domain is an ADP-ribose binding module., Karras GI, Kustatscher G, Buhecha HR, Allen MD, Pugieux C, Sait F, Bycroft M, Ladurner AG, EMBO J. 2005 Jun 1;24(11):1911-20. Epub 2005 May 19. PMID: 15902274

This OCA Structure page
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