The Wellcome Trust Sanger Institute, Hinxton, Cambs, UK. ql2@sanger.ac.uk|The Wellcome Trust Sanger Institute, Hinxton, Cambs, UK. ql2@sanger.ac.uk|The Wellcome Trust Sanger Institute, Hinxton, Cambs, UK. ql2@sanger.ac.uk|The Wellcome Trust Sanger Institute, Hinxton, Cambs, UK. ql2@sanger.ac.uk