4KPI:
reference: The rotational order-disorder structure of the reversibly photoswitchable red fluorescent protein rsTagRFP., Pletnev S, Subach FV, Verkhusha VV, Dauter Z, Acta Crystallogr D Biol Crystallogr. 2014 Jan;70(Pt 1):31-9. doi:, 10.1107/S1399004713024644. Epub 2013 Dec 24. PMID: 24419376

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