5YVD:
reference: Structural and biochemical characterization of endoribonuclease Nsp15 encoded by Middle East respiratory syndrome coronavirus., Zhang L, Li L, Yan L, Ming Z, Jia Z, Lou Z, Rao Z, J Virol. 2018 Aug 22. pii: JVI.00893-18. doi: 10.1128/JVI.00893-18. PMID: 30135128

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).