[1] Univ Turin, Dept Genet Biol & Biochem, I-10126 Turin, Italy
[2] San Giovanni Battista Hosp, Expt Med Res Ctr, Turin, Italy
[3] Univ Modena & Reggio Emilia, Ctr Hemochromatosis, Dept Internal Med, Modena, Italy
[4] Childrens Hosp, Div Hematol Oncol, Boston, MA 02115 USA
[5] Howard Hughes Med Inst, Boston, MA 02115 USA
[6] Harvard Univ, Sch Med, Boston, MA USA