4ACP:
reference: Selective Deactivation of Serum IgG: A General Strategy for the Enhancement of Monoclonal Antibody Receptor Interactions., Baruah K, Bowden TA, Krishna BA, Dwek RA, Crispin M, Scanlan CN, J Mol Biol. 2012 Apr 5. PMID: 22484364

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