5M2R:
reference: Conserved Residues in Ycf54 are required for Protochlorophyllide Formation in Synechocystis sp. PCC 6803., Hollingshead S, Bliss S, Baker PJ, Hunter CN, Biochem J. 2016 Dec 22. pii: BCJ20161002. doi: 10.1042/BCJ20161002. PMID: 28008132

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