Institution: | 1 Cambridge University Dept of Medical Genetics, Addenbrooke's Hospital, Cambridge CB2 2QQ, UK 2 The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire CB10 1SA, UK 3 K.U. Leuven, ESAT/SCD, Kasteelpark Arenberg 10, B-3001 Leuven-Heverlee, Belgium |