4NC1:
reference: Structural Basis for Antibody Recognition in the Receptor-Binding Domains of Toxins A and B from Clostridium difficile., Murase T, Eugenio L, Schorr M, Hussack G, Tanha J, Kitova EN, Klassen JS, Ng KK, J Biol Chem. 2013 Dec 5. PMID: 24311789

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