6CNY:
reference: Conformational switching in the fungal light sensor Vivid., Zoltowski BD, Schwerdtfeger C, Widom J, Loros JJ, Bilwes AM, Dunlap JC, Crane BR, Science. 2007 May 18;316(5827):1054-7. PMID: 17510367

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