4HRS:
reference: Crystal structure of the ubiquitin-like small archaeal modifier protein 2 from Haloferax volcanii., Li Y, Maciejewski MW, Martin J, Jin K, Zhang Y, Maupin-Furlow JA, Hao B, Protein Sci. 2013 Jul 2. doi: 10.1002/pro.2305. PMID: 23821306

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