4BYH:
reference: Crystal structure of sialylated IgG Fc: Implications for the mechanism of intravenous immunoglobulin therapy., Crispin M, Yu X, Bowden TA, Proc Natl Acad Sci U S A. 2013 Aug 8. PMID: 23929778

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