5M2A:
reference: Photoactivation mechanism of a bacterial light-regulated adenylyl cyclase., Lindner R, Hartmann E, Tarnawski M, Winkler A, Frey D, Reinstein J, Meinhart A, Schlichting I, J Mol Biol. 2017 Mar 20. pii: S0022-2836(17)30124-9. doi:, 10.1016/j.jmb.2017.03.020. PMID: 28336405

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