4K6L:
reference: Structure and function of the Salmonella Typhi chimaeric A(2)B(5) typhoid toxin., Song J, Gao X, Galan JE, Nature. 2013 Jul 18;499(7458):350-4. doi: 10.1038/nature12377. Epub 2013 Jul 10. PMID: 23842500

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