2ZO7:
reference: Crystal structure of a new cyan fluorescent protein and its hue-shifted variants., Kikuchi A, Fukumura E, Karasawa S, Shiro Y, Miyawaki A, Biochemistry. 2009 Jun 16;48(23):5276-83. PMID: 19402703

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