1LT4:
reference: Crystal structure of a non-toxic mutant of heat-labile enterotoxin, which is a potent mucosal adjuvant., van den Akker F, Pizza M, Rappuoli R, Hol WG, Protein Sci 1997 Dec;6(12):2650-4. PMID: 9416617

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