1 Laboratory of Clinical Investigation, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA; Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
2 Laboratory of Clinical Investigation, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA.
3 Inserm UMR1190 - Translational Research of Diabetes, Pôle recherche 3ème Ouest, 1, place de Verdun 59045 Lille Cedex, France.
4 Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
5 Laboratory of Molecular Biology & Immunology, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA.
6 Laboratory of Clinical Investigation, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA. Electronic address: doyleme@nih.gov.