1UYJ:
reference: Clostridium perfringens epsilon-toxin shows structural similarity to the pore-forming toxin aerolysin., Cole AR, Gibert M, Popoff M, Moss DS, Titball RW, Basak AK, Nat Struct Mol Biol. 2004 Aug;11(8):797-8. Epub 2004 Jul 18. PMID: 15258571

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