3LC9:
reference: Introduction of a disulfide bond leads to stabilization and crystallization of a ricin immunogen., Compton JR, Legler PM, Clingan BV, Olson MA, Millard CB, Proteins. 2011 Apr;79(4):1048-60. doi: 10.1002/prot.22933. Epub 2011 Jan, 5. PMID: 21387408

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