1. Centre for Comparative Genomics and Evolutionary Bioinformatics, Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, Canada
2. Departament de Genètica & Institut de Recerca en Biodiversitat (Irbio), Universitat de Barcelona, Barcelona, Spain
3. Institució Catalana per la Recerca i Estudis Avançats (ICREA), Parc Científic de Barcelona, Barcelona, Spain
4. Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas