[1] Univ Maryland, Sch Pharm, Ctr EPR Imaging In Vivo Physiol, Baltimore, MD 21201 USA
[2] Univ Maryland, Ctr Med Biotechnol, Inst Biotechnol, Baltimore, MD 21201 USA
[3] Univ Maryland, Sch Med, Ctr Vaccine Dev, Baltimore, MD 21201 USA
[4] Biol Def Res Directorate Naval Med Res Ctr, Silver Spring, MD 20852 USA