2J4X:
reference: Crystal Structure of Streptococcus dysgalactiae-Derived Mitogen Reveals a Zinc-Binding Site and Alterations in TcR Binding., Saarinen S, Kato H, Uchiyama T, Miyoshi-Akiyama T, Papageorgiou AC, J Mol Biol. 2007 Nov 9;373(5):1089-97. Epub 2007 Aug 21. PMID: 17900619

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