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Nature 400, 554-557 (5 August 1999) | doi:10.1038/23005;
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2-Methylhopanoids as biomarkers for cyanobacterial oxygenic photosynthesis
Oxygenic photosynthesis is widely accepted as the most important bioenergetic process happening in Earth's surface environment. It is thought to have evolved within the cyanobacterial lineage, but it has been difficult to determine when it began.
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