1. Parasite Cell Biology Laboratory; QIMR Berghofer Medical Research Institute; Brisbane Qld 4006 Australia
2. School of Veterinary Sciences; The University of Queensland; Gatton Qld 4343 Australia
3. School of Medical Sciences; Universiti Sains Malaysia; 16150 Kelantan Malaysia
4. Division of Mycobacterial Research; National Institute for Medical Research; London NW7 1AA UK
5. Molecular Parasitology Laboratory; QIMR Berghofer Medical Research Institute; Brisbane Qld 4006 Australia