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Backwards tracing using genetic evidence suggests lineage B.1.1.7 emerged in September 2020 and then circulated at very low levels in the population until mid-November. The increase in cases linked to the variant first became apparent in late November when Public Health England (PHE) was investigating why infection rates in Kent were not ...
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.