| 4FFE: reference: Crystal structure of the cowpox virus encoded NKG2D-ligand OMCP., Lazear E, Peterson LJ, Nelson CA, Fremont DH, J Virol. 2012 Oct 31. PMID: 23115291 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).