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Glycine and Serine Metabolism in P. marinus MED4

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Prochlorococcus is a unicellular cyanobacterium that dominates the temperate and tropical oceans. It lacks phycobilisomes that are characteristic of cyanobacteria, and contains chlorophyll b as its major accessory pigment. This enables it to absorb blue light efficiently at the low-light intensities and blue wavelengths characteristic of the deep euphotic zone. It contributes 30-80% of the total photosynthesis in the oligotrophic oceans, and thus plays a significant role in the global carbon cycle and the Earth s climate. Prochlorococcus marinus MED4 is a member of Prochlorophytes. The genome of Prochlorococcus marinus MED4, a high-light-adapted strain, is 1,657,990 base pairs (bp). This is the smallest of any oxygenic phototroph—significantly smaller than that of the low-light-adapted strain MIT9313. As an oxyphototroph, Prochlorococcus requires only light, CO2 and inorganic [...]


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