Other types of hereditary hemochromatosis are caused by mutations in the transferrin receptor-2 gene (TfR2) (Camaschella et al., 2000), hemojuvelin gene (HJV) (Papanikolaou et al., 2004), hepcidin gene (HAMP) (Roetto et al., 2003), and the ferroportin gene (SCL40A1) (Pietrangelo, 2004). The gene discussed is HAMP; the disease is hereditary hemochromatosis.