3QHF:
reference: An insertion mutation that distorts antibody binding site architecture enhances function of a human antibody., Krause JC, Ekiert DC, Tumpey TM, Smith PB, Wilson IA, Crowe JE Jr, MBio. 2011 Feb 8;2(1):e00345-10. doi: 10.1128/mBio.00345-10. Print 2011. PMID: 21304166

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