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By Mark Hoffman  Tuesday, Dec. 16, 2008
Virent Energy Systems CEO Eric Apfelbach stands near a pilot plant that converts plant sugars into gasoline. The 1979 Janesville ...

Virent Energy Systems CEO Eric Apfelbach stands near a pilot plant that converts plant sugars into gasoline. The 1979 Janesville Craig graduate is leaving Virent to pursue other entrepreneurial interests.

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