7. Desulfurococcus fermentans
According to the Joint Genome Institute, “Desulfurococcus fermentans, isolated from the Uzon Caldera on the Kamchatka Peninsula, is the only known archaeon that breaks down cellulose and, unlike most known microorganisms that carry out fermentation, it produces hydrogen (via proton reduction) while fermenting cellulose and starch without experiencing an inhibition of growth.
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