European Bioinformatics Institute, EMBL Outstation - Hinxton, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK. lcwang@ebi.ac.uk|European Bioinformatics Institute, EMBL Outstation - Hinxton, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK. lcwang@ebi.ac.uk|European Bioinformatics Institute, EMBL Outstation - Hinxton, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK. lcwang@ebi.ac.uk