5BK2:
reference: Engineered synthetic antibodies as probes to quantify the energetic contributions of ligand binding to conformational changes in proteins., Mukherjee S, Griffin DH, Horn JR, Rizk SS, Nocula-Lugowska M, Malmqvist M, Kim SS, Kossiakoff AA, J Biol Chem. 2018 Jan 10. pii: RA117.000656. doi: 10.1074/jbc.RA117.000656. PMID: 29321208

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