1. Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 PO WITS 2050 South Africa
2. WITS Research Institute for Malaria (WRIM) University of the Witwatersrand 7 York Road Parktown 2193 South Africa
3. Department of Biochemistry and Microbiology Rhodes University Makhanda 6140 South Africa
4. Center for Emerging and Re-emerging Infectious Diseases (CERID) Division of Allergy and Infectious Diseases Department of Medicine University of Washington Seattle WA 98109 USA