4Q7T:
reference: Orange Fluorescent Proteins: Structural Studies of LSSmOrange, PSmOrange and PSmOrange2., Pletnev S, Shcherbakova DM, Subach OM, Pletneva NV, Malashkevich VN, Almo SC, Dauter Z, Verkhusha VV, PLoS One. 2014 Jun 24;9(6):e99136. doi: 10.1371/journal.pone.0099136. eCollection, 2014. PMID: 24960050

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