1. School of Science, University of Waikato; Private Bag 3105 Hamilton 3240 New Zealand
2. Seafood Research Unit, Plant and Food Research; PO Box 5114 Port Nelson 7043 New Zealand
3. Biochemistry Department; University of Otago; PO Box 56 Dunedin 9054 New Zealand
4. AgResearch Grasslands Research Centre; Private Bag 11008 Palmerston North New Zealand