[1] HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT HISTOCHEM,LONDON W12 0NN,ENGLAND
[2] ROYAL COLL SURG ENGLAND,DEPT PHARMACOL,LONDON WC2A 3PN,ENGLAND
[3] IMPERIAL CANC RES FUND,LONDON WC2A 3PX,ENGLAND
[4] WELLCOME RES LABS,BECKENHAM BR3 3BS,KENT,ENGLAND