1. School of Molecular and Microbial Sciences and School of Pharmacy, The University of Queensland, Brisbane, Queensland 4072, Australia, Dr. T. B. Lynch, Pathologist, Anzac House, East and Archer Streets, Rockhampton, Queensland 4700, Australia, and Alchemia Pty Ltd, 3 Hi-Tech Court, Brisbane Technology Park, Eight Mile Plains, Queensland 4113, Australia