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Location of the psa genes in the chloroplast genome of Arabidopsis thaliana.The 21 protein-coding genes involved in photosynthesis are displayed as green boxes. Photosystem I (PSI, or plastocyanin–ferredoxin oxidoreductase) is one of two photosystems in the photosynthetic light reactions of algae, plants, and cyanobacteria.
455 – Emperor Avitus enters Italy with a Gallic army and consolidates his power. [1]1170 – Anglo-Norman invasion of Ireland: The Kingdom of Dublin falls to Anglo-Norman invaders.