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Summary The Photosystem I (PS I) complex in cyanobacteria functions most typically as a light-driven, cytochrome c6:ferredoxin oxidoreductase. The adaptability of cyanobacteria to conditions of nutrient availability allows cytochrome c6 to be replaced by plastocyanin when copper is plentiful, and ferredoxin to be replaced by flavodoxin when iron is limiting. These changes, however, do not lead to...
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