1. Department of Biology, University of Padova, via U. Bassi, 58/b, 35100 Padova, Italy
2. Department of Biochemistry and Molecular Biology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA
3. National Institute of Nutrition, 00178 Roma, Italy
4. Ross Products Division, Abbott Laboratories Incorporated, Columbus, OH 43215, USA
5. National Institute of Occupational Safety and Health, Cincinnati, OH 45226, USA
6. Simon Rodriguez University, Apartado Postal (PO Box) 47.925, Caracas 1041–A, Venezuela
7. Fondo Nacional de Investigaciones Agropecuarias Amazonas, Puerto Ayacucho, Venezuela