1UPN:
reference: The structure of echovirus type 12 bound to a two-domain fragment of its cellular attachment protein decay-accelerating factor (CD 55)., Bhella D, Goodfellow IG, Roversi P, Pettigrew D, Chaudhry Y, Evans DJ, Lea SM, J Biol Chem. 2004 Feb 27;279(9):8325-32. Epub 2003 Nov 21. PMID: 14634014

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