1GGB:
reference: Major antigen-induced domain rearrangements in an antibody., Stanfield RL, Takimoto-Kamimura M, Rini JM, Profy AT, Wilson IA, Structure 1993 Oct 15;1(2):83-93. PMID: 8069628

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