5NB3:
reference: An improved crystal structure of C-phycoerythrin from the marine cyanobacterium Phormidium sp. A09DM., Sonani RR, Roszak AW, Ortmann de Percin Northumberland C, Madamwar D, Cogdell RJ, Photosynth Res. 2017 Sep 16. doi: 10.1007/s11120-017-0443-2. PMID: 28918447

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