1. Center for Molecular Structural Biology, Brazilian Laboratory of Synchrotron Light, Campinas, Brazil, Department of Biochemistry, Institute of Chemistry, and Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil, Department of Biophysics, Federal University of São Paulo, São Paulo, Brazil, and Department of Experimental Medicine, Section of Chemistry and Structural Biochemistry, University of Parma, Parma, Italy