[1] Univ Modena & Reggio Emilia, Dept Anat & Histol, I-41100 Modena, Italy
[2] Univ Bologna, Dept Biochem G Moruzzi, I-40126 Bologna, Italy
[3] Univ Lyon 1, S Lyon Med Fac, Carmen Inst, INSERM,U1060, F-69921 Oullins, France
[4] Univ E Anglia, Norwich Med Sch, Dept Nutr, Norwich NR4 7TJ, Norfolk, England