Affiliation: | 1. M.R.C. Human Biochemical Genetics Unit, Galton Laboratory, University College London, Wolfon House, 4 Stephenson Way, London, NW1 2HE. U.K.;2. Harris Birthright Research Centre for Fetal Medicine, Departments of Obstetrics and Gynaecology, Chemical Pathology and Child Health, King's College Hospital, Denmark Hill, London, SE5 8RX, U.K. |