[1] Dupont Merck Pharmaceut Co, Dept Inflammatory Dis Res, Wilmington, DE 19880 USA
[2] Dupont Merck Pharmaceut Co, Dept Appl Biotechnol, Wilmington, DE 19880 USA
[3] Dupont Merck Pharmaceut Co, Dept Enzymol, Wilmington, DE 19880 USA
[4] Dupont Merck Pharmaceut Co, Dept Chem & Phys Sci, Wilmington, DE 19880 USA
[5] Univ Kansas, Sch Med, Dept Biochem & Mol Biol, Kansas City, KS 66160 USA