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Exhibit 13-5

Cellulosic Ethanol Production Process

Three primary polymers exist in the walls of plant cells – cellulose, hemicellulose and lignin. To convert cellulose to ethanol, the chains of cellulose molecules must be broken into sugars and then fermented into ethanol using yeasts.

For more information on this exhibit, please contact the Comptroller’s Data Services Division at 512-463-4900 or at P.O. Box 13528, Austin, Texas 78711-3528.

Sources: U.S. Department of Energy and Renewable Fuels Association.

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