Institution: | a National Institute for Medical Research, Division of Developmental Biology, The Ridgeway, Mill Hill, London, NW7 1AA, UK b Wellcome Trust Sanger Institute, Wellcome Trust Genome, Campus Hinxton, Cambridge, CB10 1SA, UK c Department of Biochemistry and Biophysics, Programs in Developmental Biology, Genetics and Human Genetics, Liver Center, University of California, San Francisco, CA 94158, USA |