Center for Bioinformatics, Saarland University, Saarland Informatics Campus E2.1, Saarbrücken, Germany.|Center for Bioinformatics, Saarland University, Saarland Informatics Campus E2.1, Saarbrücken, Germany.|UC Santa Cruz Genomics Institute, University of California, Santa Cruz, CA, USA.|Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.|Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.|Center for Bioinformatics, Saarland University, Saarland Informatics Campus E2.1, Saarbrücken, Germany.