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Although the Photosynthetic Reaction Center that Huber, Michel and Deisenhofer solved (Protein DataBank entry 1PRC) was from a photosynthetic bacterium, it was not a cyanobacterium. Rhodopseudomonas viridis (now Blastochloris viridis) is an alpha-proteobacterium, also classified as "purple non-sulfur photosynthetic bacteria". Cyanobacteria have reaction centers (Photosystems I and II) nearly identical to those of chloroplasts in higher plants. I suggest "cyanobacteria" be replaced by "photosynthetic bacteria" at all occurrences.
OK, no one objected, so I have done so. Remaining reference to cyanobacterial PS II is correct.
