WIDE GENETIC VARIABILITY IN PHYTOPLANKTON. “In 2003, Prochlorococcus became one of the first marine microbes to have its entire set of genes sequenced. It’s an impressively small genome for the most abundant photosynthetic organism on the planet, for the source of the oxygen filling every fifth breath you take. . While individual Prochlorococcus genomes share a core of about 1,200 genes, hundreds of other genes vary wildly from strain to strain.””
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