1. AgResearch (H.W.D., T.X., M.J.M.), Ruakura Research Centre, Hamilton 2001, New Zealand
2. Department of Biology (T.X., R.J.W.), University of Waikato, Hamilton 2001, New Zealand
3. Division of Cell and Molecular Biology (D.J.W.), Department of Biology, Boston University, Boston, Massachusetts 02215
4. Department of Anatomy and Structural Biology (D.R.G.), School of Medical Sciences, University of Otago, Dunedin 6001, New Zealand