1. Department of Computer Science, University of Otago, Dunedin, New Zealand.
2. School of Mathematics and Statistics, University of Canterbury, Christchurch, New Zealand.
3. Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australia.
4. Cold Spring Harbor Laboratory, New York, New York, USA.
5. Department of Biochemistry, University of Otago, Dunedin, New Zealand.