1S6Z:
reference: The crystal structure of the Y66L variant of green fluorescent protein supports a cyclization-oxidation-dehydration mechanism for chromophore maturation., Rosenow MA, Huffman HA, Phail ME, Wachter RM, Biochemistry 2004 Apr 20;43(15):4464-72. PMID: 15078092

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