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Chloroplasts are the result of endosymbiosis of cyanobacterial organisms with proto‐eukaryotes. The psbA, psbD and psbO genes are present in all oxyphototrophs and encode the D1/D2 proteins of photosystem II (PSII) and PsbO, respectively. PsbO is a peripheral protein that stabilizes the O2‐evolving complex in PSII. Of these genes, psbA and psbD remained in the chloroplastic genome, while psbO was...