1. Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, Michigan, USA
2. Department of Biochemistry & Biophysics, Texas A&M University, College Station, Texas, USA
3. Centre National de la Recherche Scientifique, Laboratoire d'Ecologie Microbienne (UMR CNRS 5557, UMR INRAE 1418, VetAgro Sup), Universite Claude Bernard Lyon 1, Villeurbanne, France