2MQE:
reference: The periplasmic domain of Escherichia coli outer membrane protein A can undergo a localized temperature dependent structural transition., Ishida H, Garcia-Herrero A, Vogel HJ, Biochim Biophys Acta. 2014 Aug 15. pii: S0005-2736(14)00290-9. doi:, 10.1016/j.bbamem.2014.08.008. PMID: 25135663

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