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Science 24 March 2006:
Vol. 311. no. 5768, pp. 1724 - 1725
DOI: 10.1126/science.1125937
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Perspectives

EVOLUTION:
Tracing Oxygen's Imprint on Earth's Metabolic Evolution

Paul G. Falkowski

As oxygen built up in Earth's atmosphere during the Precambrian, organisms evolved more complex biochemical networks. This expansion made feasible oxygen dependent metabolisms that coopted parts of preexisting anaerobic ones.

The author is with the Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences and Department of Geological Sciences, Rutgers University, New Brunswick, NJ 08901, USA. E-mail: falko{at}imcs.rutgers.edu

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