This model represents the enzyme responsible for the first step in the modification of the ring A vinyl group of chlorophyllide a which (in part) distinguishes chlorophyll from bacteriochlorophyll. This enzyme is aparrently absent from cyanobacteria (which do not use bacteriochlorophyll). [Energy metabolism, Photosynthesis]
Jiyao W et al.(2023). "The conserved domain database in 2023.",