Institution: | (1) Department of Genetics, University of Cambridge, CB2 3EH Cambridge, UK;(2) Present address: Institute of Cytology and Genetics, Siberian Division of the U.S.S.R. Academy of Sciences, 630090 Novosibirsk, USSR;(3) Present address: Faculdad de Ciencias, Universidad Autonoma de Madrid, Ciudad Universitaria de Canto Blanco, Madrid 34, Spain |