1XOC:
reference: The structure of the oligopeptide-binding protein, AppA, from Bacillus subtilis in complex with a nonapeptide., Levdikov VM, Blagova EV, Brannigan JA, Wright L, Vagin AA, Wilkinson AJ, J Mol Biol. 2005 Jan 28;345(4):879-92. PMID: 15588833

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