6WOJ:
reference: The SARS-CoV-2 conserved macrodomain is a mono-ADP-ribosylhydrolase., Alhammad YMO, Kashipathy MM, Roy A, Gagne JP, McDonald P, Gao P, Nonfoux L, Battaile KP, Johnson DK, Holmstrom ED, Poirier GG, Lovell S, Fehr AR, J Virol. 2020 Nov 6. pii: JVI.01969-20. doi: 10.1128/JVI.01969-20. PMID: 33158944

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