Affiliation: | (1) School of Biological Sciences, University of Bath, BA2 7AY Bath, UK;(2) Department of Molecular Genetics, GD Searle and Company Ltd., Lane End Road, HP12 4HL High Wycombe, Bucks, UK;(3) Present address: Department of Molecular Genetics, Connaught Research Institute, 1755 Steeles Ave West, M2R 3T4 Willowdale, Ontario, Canada |