3EJG: Crystal Structure Of Hcov-229e X-Domain
reference: Crystal structures of the X-domains of a Group-1 and a Group-3 coronavirus reveal that ADP-ribose-binding may not be a conserved property., Piotrowski Y, Hansen G, Boomaars-van der Zanden AL, Snijder EJ, Gorbalenya AE, Hilgenfeld R, Protein Sci. 2009 Jan;18(1):6-16. PMID: 19177346

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