1. Red Cell Physiology Laboratory, New York Blood Center, New York, NY;
2. Molecular Biology Research Center, School of Biological Science and Technology and State Key Laboratory of Medical Genetics of China, Central South University, Changsha, China;
3. Laboratory of Membrane Biology, New York Blood Center, New York, NY;
4. Erythropoiesis Laboratory, New York Blood Center, New York, NY; and
5. Department of Medicine, University of Verona, Verona, Italy