1. INRA, Laboratoire de Pharmacologie-Toxicologie, 180 Chemin de Tournefeuille, B.P. 3, 31931 Toulouse, France; State Institute for Quality Control of Agricultural Products (RIKILT-DLO), P.O. Box 230, 6700 AE Wageningen, The Netherlands; and Unidad de Hepatologia Experimental, Centro de Investigacion, Hospital La Fe, SVS Avenida Campanar 21, E-46009 Valencia, Spain