[1] OSAKA UNIV,SCH MED,INST HIGHER NERVOUS ACTIV,DEPT NEUROANAT,KITA KU,OSAKA 530,JAPAN
[2] OSAKA UNIV,SCH MED,DEPT PHARMACOL 1,KITA KU,OSAKA 530,JAPAN
[3] MRC CTR,SCH MED,NEUROCHEM PHARMACOL UNIT,CAMBRIDGE CB2 20H,ENGLAND
[4] UNIV LONDON,HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT CHEM PATHOL,LONDON W12 0HS,ENGLAND