Genomics and chloroplast evolution: what did cyanobacteria do for plants?
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Genome Biology 2003, 4:209 doi:10.1186/gb-2003-4-3-209Published: 3 March 2003
The complete genome sequences of cyanobacteria and of the higher plant Arabidopsis thaliana leave no doubt that the plant chloroplast originated, through endosymbiosis, from a cyanobacterium. But the genomic legacy of cyanobacterial ancestry extends far beyond the chloroplast itself, and persists in organisms that have lost chloroplasts completely.