3WBD:
reference: Crystal structure of anti-polysialic acid antibody single chain Fv fragment complexed with octasialic acid: insight into the binding preference for polysialic acid., Nagae M, Ikeda A, Hane M, Hanashima S, Kitajima K, Sato C, Yamaguchi Y, J Biol Chem. 2013 Nov 22;288(47):33784-96. doi: 10.1074/jbc.M113.496224. Epub, 2013 Oct 7. PMID: 24100042

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