Photosynthesis: what color was its origin?
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Genome Biology 2006, 7:245 doi:10.1186/gb-2006-7-12-245Published: 3 January 2007
Recent studies using geological and molecular phylogenetic evidence suggest several alternative evolutionary scenarios for the origin of photosynthesis. The earliest photosynthetic group is variously thought to be heliobacteria, proteobacteria or a precursor of cyanobacteria, organisms whose photosynthetic pigments make them different colors.