6AA7:
reference: Spectral and structural analysis of a red fluorescent protein from Acropora digitifera., Kim SE, Hwang KY, Nam KH, Protein Sci. 2019 Feb;28(2):375-381. doi: 10.1002/pro.3540. Epub 2018 Nov 27. PMID: 30368951

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