A. Amores, A. Force, Y.-L. Yan, Y.-L. Wang, M. Westerfield, J. H. Postlethwait, Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA. L. Joly and M. Ekker, Loeb Institute of Medical Research, Ottawa Civic Hospital, Ottawa, Ontario K1Y 4E9, Canada. C. Amemiya, Center for Human Genetics, Boston University School of Medicine, Boston, MA 02118, USA. A. Fritz, Department of Biology, Emory University, Atlanta, GA 30322, USA. R. K. Ho, Department of Molecular Biology, Princeton University...(At 1998-11-27)