4YPT:
reference: X-ray Structural and Functional Studies of the Three Tandemly-Linked Domains of Nsp3 from Murine Hepatitis Virus Reveal Conserved Functions., Chen Y, Savinov SN, Mielech AM, Cao T, Baker SC, Mesecar AD, J Biol Chem. 2015 Aug 19. pii: jbc.M115.662130. PMID: 26296883

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