2AXC:
reference: High-resolution crystal structure of a truncated ColE7 translocation domain: implications for colicin transport across membranes., Cheng YS, Shi Z, Doudeva LG, Yang WZ, Chak KF, Yuan HS, J Mol Biol. 2006 Feb 10;356(1):22-31. Epub 2005 Dec 5. PMID: 16360169

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