5JVA:
reference: The crystal structure of red fluorescent protein TagRFP-T reveals the mechanism of its superior photostability., Liu R, Liang QN, Du SQ, Hu XJ, Ding Y, Biochem Biophys Res Commun. 2016 Aug 19;477(2):229-34. doi:, 10.1016/j.bbrc.2016.06.047. Epub 2016 Jun 11. PMID: 27297107

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