2XRQ:
reference: Crystal Structures Exploring the Origins of the Broader Specificity of Escherichia coli Heat-Labile Enterotoxin Compared to Cholera Toxin., Holmner A, Mackenzie A, Okvist M, Jansson L, Lebens M, Teneberg S, Krengel U, J Mol Biol. 2011 Feb 25;406(3):387-402. Epub 2010 Dec 17. PMID: 21168418

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