2W7Y:
reference: Blood Group Antigen Recognition by a Solute-Binding Protein from a Serotype 3 Strain of Streptococcus pneumoniae., Higgins MA, Abbott DW, Boulanger MJ, Boraston AB, J Mol Biol. 2009 Mar 12. PMID: 19285508

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