Located between 200 and 1,000 meters below the ocean surface is a "twilight zone" where insufficient sunlight penetrates for microorganisms to perform photosynthesis. Details are now emerging about a microbial metabolic pathway that helps solve the mystery of how certain bacteria capture carbon in the dark ocean, enabling a better understanding of what happens to the carbon that is fixed in the oceans every year. They appear in the September 2, 2011, edition of Science.
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