Besides the chlorosome BChls (c,d,e), BChl a is the primary pigment found in the baseplate, FMO protein, RC, and core antenna domain. Each PsaA is associated with eight BChl, the lowest number of any FeS-type RC core -45], One could speculate that having the chlorosome (a light-harvesting system with an extremely large cross-section), available, drove photosystem evolution in GSB to refine coupling to the chlorosome. Heliobacteria and cyanobacteria, in contrast, were driven to accumulate pigments within the RC core antennae. The biosynthesis of Bchl a, c, d, and e of green sulfur bacteria has been clarified by functional genomics [51].

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