1. Institute of Fundamental Sciences, PB 11 222, Palmerston North, New Zealand
2. Allan Wilson Centre for Molecular Ecology and Evolution, Massey University, Auckland, New Zealand
3. Linnaeus Center for Bioinformatics, Uppsala University, Box 598, 751 24 Uppsala, Sweden
4. Institute of Molecular Biosciences, Massey University, PB 11 222, Palmerston North, New Zealand