1. Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.
2. Whitney Laboratory for Marine Bioscience, University of Florida, St. Augustine, FL 32080, USA.
3. Department of Biology, University of Florida, Gainesville, FL 32611, USA.
4. National Centre for Biomedical Engineering Science, National University of Ireland Galway, Galway, Ireland.
5. Computational and Statistical Genomics Branch, Division of Intramural Research, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.