1. Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand, National Institute of Water and Atmospheric Research, P.O. Box 14-901, Kilbirnie, Wellington, New Zealand, Department of Biological Science, State University of Fullerton, Fullerton, California 92834, and Malaghan Institute of Medical Research, Level H, Wellington School of Medicine, P.O. Box 7060, Wellington South, New Zealand b.copp@auckland.ac.nz