[1] NCI, Expt Transplantat & Immunol Branch, Bethesda, MD 20892 USA
[2] NINDS, In Vivo NMR Ctr, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[3] NINDS, Lab Funct & Mol Imaging, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[4] NCI, Lab Immune Cell Biol, Bethesda, MD 20892 USA
[5] NIAID, Mucosal Immunol Sect, 9000 Rockville Pike, Bethesda, MD 20892 USA
[6] NIH, Diagnost & Res Serv Branch, Off Director, Bldg 10, Bethesda, MD 20892 USA