4PYT:
reference: LucY: A Versatile New Fluorescent Reporter Protein., Auldridge ME, Cao H, Sen S, Franz LP, Bingman CA, Yennamalli RM, Phillips GN Jr, Mead D, Steinmetz EJ, PLoS One. 2015 Apr 23;10(4):e0124272. doi: 10.1371/journal.pone.0124272., eCollection 2015. PMID: 25906065

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