European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambs, UK. junker@ebi.ac.uk|European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambs, UK. junker@ebi.ac.uk|European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambs, UK. junker@ebi.ac.uk