[1] STATE UNIV UTRECHT,DEPT BIOCHEM,UTRECHT,NETHERLANDS
[2] MAYO CLIN & MAYO FDN,DEPT NEUROL,ROCHESTER,MN 55901
[3] HOSP UNIV PENN,DEPT NEUROL,PHILADELPHIA,PA 19104
[4] UNIV ILLINOIS,DEPT CHEM,CHAMPAIGN,IL 61820
[5] UNIV KENTUCKY,DEPT CHEM,LEXINGTON,KY 40506
[6] CSIRO,DIV HUMAN NUTR,GLENTHORNE LABS,ADELAIDE,SA 5000,AUSTRALIA