1. Section de Bioénergétique, CNRS URA 2096, CEA Saclay, Bât. 532, 91191 Gif-sur-Yvette Cedex, France, Departments of Chemistry and Biochemistry, Michigan State University, East Lansing, Michigan 48824, Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77225, and Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461