| http://www.w3.org/ns/prov#value | - Then there are two complicated steps: first, introducing enzymes, called cellulases, to break the cellulose down into glucose and xylose; and second, using yeast and other microorganisms to ferment those sugars into ethanol.The step that has perplexed scientists is the one involving enzymes ??? proteins that come in an almost infinite variety of three-dimensional structures.
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