1. School of Chemistry and Biochemistry, and the Petit Institute for Bioscience and Bioengineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0400
2. Sandler Center for Basic Research in Parasitic Diseases, California Institute for Quantitative Biosciences, University of California, San Francisco, California 94158
3. Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, CZ-370 05, Czech Republic