1. Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia1;
2. Malaria Program, Naval Medical Research Center, Silver Spring, Maryland 209102;
3. Malaria Vaccine Development Unit, NIAID, National Institutes of Health, Rockville, Maryland 208523; and
4. Institute for Microbiology, Parasitology and Entomology, Hanoi, Vietnam4