[1] NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812
[2] DUPONT CO,DEPT CENT RES & DEV,WILMINGTON,DE 19880
[3] UPJOHN CO,KALAMAZOO,MI 49001
[4] MERCK SHARP & DOHME RES LABS,RAHWAY,NJ 07065
[5] SCHERING PLOUGH CORP,BLOOMFIELD,NJ 07003
[6] UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98195
[7] UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521
[8] UNIV OXFORD,MOLEC BIOPHYS LAB,OXFORD OX1 3QU,ENGLAND
[9] WELLCOME RES LABS,BECKENHAM BR3 3BS,KENT,ENGLAND