1. Department of Chemistry; University of Cape Town; Rondebosch, Cape Town South Africa
2. Department of Biomedical Science; University of Cagliari; Monserrato (CA) Italy
3. International Centre for Genetic Engineering and Biotechnology; Cape Town South Africa
4. Division of Medical Biochemistry; University of Cape Town; Cape Town South Africa
5. MRC/UCT Receptor Biology Unit, Institute of Infectious Disease and Molecular Medicine; University of Cape Town; Cape Town South Africa
6. Department of Human Biology, Division of Physiology; University of Cape Town; Cape Town South Africa