[1] KAROLINSKA INST,DEPT PHARMACOL & BIOCHEM 2,S-10401 STOCKHOLM 60,SWEDEN
[2] UNIV UPPSALA,DEPT PHARMACOL,S-75105 UPPSALA,SWEDEN
[3] UNIV LONDON,HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT HISTOCHEM,LONDON,ENGLAND
[4] UNIV LONDON,HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT MED,LONDON,ENGLAND
[5] UNIV MINNESOTA,DEPT ANAT,MINNEAPOLIS,MN 55455
[6] NYU MED CTR,DEPT PSYCHIAT,NEW YORK,NY 10016