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A genus of bacteria that belongs to the Cyanobacteria (q.v.). The cells are coccoid and divide by binary fission in two or three planes to produce clusters of cells. One species from this genus (referred to as sp. strain PCC 6803) has had its genome completely sequenced. It is made up of 3.57 mb of DNA and contains 3,168 ORFs. Genes homologous to 45 of the ORFs from Synechocystis have been found in the chloroplasts of a wide variety of photosynthetic protoctists and land plants. See Chronology, 1996, Kaneko et al.; Arabidopsis thaliana, chloroplast, serial symbiosis theory.

Subjects: Genetics and Genomics.

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