Biliary excretion of plasma non-transferrin bound iron in the rat is enhanced by the novel hydroxypyrid-4-one oral chelators * Dept. of Experimental Medicine, University of L'Aquila, Italy, *Dept of Haematology, University of London, UK, #Laboratoire de Biochimie CHRU Grenoble, France, +Dept of Pharmacy, King's College, London, UK and INSERM U49, University Hospital Pontchaillou, Rennes, France