1. Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey
2. Departmento de Microbiologia, Falcultad de Ciencias, Universidad de Granada, Granada, Spain
3. Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey and Instituto de Parasitologia y Biomedicina, Dpto de Bioquimica y Farmacologia, Calle Ventanilla, Granada, Spain.