Affiliation: | (1) School of Biological Sciences, University of Sussex, Falmer, BN1 9QG Brighton, East Sussex, UK;(2) Imperial Cancer Research Fund, Lincoln's Inn Fields, P.O. Box 123, WC2A 3PX London, UK;(3) Present address: Cold Spring Harbor Laboratory, P.O. Box 100, 11724 Cold Spring Harbor, NY, USA;(4) Present address: Cancer Research Unit, Royal Victoria Infirmary, Queen Victoria Road, NE1 4LP Newcastle-upon-Tyne, UK |