[1] Columbia Univ, Dept Pharmacol, New York, NY 10032 USA
[2] Columbia Univ, Dept Med, New York, NY 10032 USA
[3] Johns Hopkins Univ, Dept Biochem, Baltimore, MD USA
[4] Johns Hopkins Univ, Sch Hyg & Publ Hlth, Baltimore, MD USA
[5] Polish Acad Sci, Ctr Mol & Macromol Studies, Dept Bioorgan Chem, Lodz, Poland
[6] US FDA, Div Therapeut Prot, Bethesda, MD 20014 USA