[1] UNIV EDINBURGH,DEPT BIOCHEM,IMPERIAL CANC RES FUND,MOLEC PHARMACOL & DRUG METAB LAB,EDINBURGH EH8 9XD,SCOTLAND
[2] UNIV EDINBURGH,DEPT MOLEC BIOL,EDINBURGH EH9 3AN,SCOTLAND
[3] UNIV COLL SWANSEA,SCH BIOL SCI,SWANSEA SA2 8PP,W GLAM,WALES
[4] WESTERN GEN HOSP,MRC,CLIN & POPULAT CYTOGENET UNIT,EDINBURGH EH4 2XU,MIDLOTHIAN,SCOTLAND
[5] NYU MED CTR,DEPT CELL BIOL,NEW YORK,NY 10016