1. Department of Internal MedicineYale University School of Medicine New Haven CT 06520 USA
2. Department of Physiology and BiophysicsInstitute of Biomedical SciencesUniversity of Sao Paulo Sao Paulo Brazil 05508‐000
3. Cellular & Molecular PhysiologyYale University School of Medicine New Haven CT 06520 USA
4. Comparative MedicineYale University School of Medicine New Haven CT 06520 USA
5. ImmunobiologyYale University School of Medicine New Haven CT 06520 USA
6. Department of MedicineUniversity of Pittsburgh Pittsburgh PA 15261 USA
7. Howard Hughes Medical InstituteYale University School of Medicine New Haven CT 06520 USA