3MK3:
reference: Crystal structure analysis of icosahedral lumazine synthase from Salmonella typhimurium, an antibacterial drug target., Kumar P, Singh M, Karthikeyan S, Acta Crystallogr D Biol Crystallogr. 2011 Feb;67(Pt 2):131-9. Epub 2011, Jan 15. PMID: 21245535

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