Institution: | (1) MRC Human Biochemical Genetics Unit, University College London, Wolfson House, 4 Stephenson Way, NW1 2HE London, England;(2) Division of Immunochemical Genetics, Clinical Research Centre, Watford Road, HA1 3UJ Harrow, Middlesex, England;(3) Department of Chemical Pathology, St. Bartholomew's Hospital, EC1 London, England;(4) Present address: Department of Health and Human Services, National Heart, Lung and Blood Institute, National Institutes of Health, 20205 Bethesda, Maryland, USA |