2O2L:
reference: Blood Group Antigen Recognition by Escherichia coli Heat-labile Enterotoxin., Holmner A, Askarieh G, Okvist M, Krengel U, J Mol Biol. 2007 Aug 17;371(3):754-64. Epub 2007 May 31. PMID: 17586525

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