1. Department of Molecular Biomedicine; Center of Research and Advanced Studies of the I.P.N; Mexico City, D.F. Mexico
2. High School of Medicine of the I.P.N; Molecular Modeling Laboratory and Drug Design; Mexico City, D.F. Mexico
3. Cuajimalpa Unit., Department of Natural Sciences; Metropolitan Autonomous University; Mexico City, D.F. Mexico
4. Institut Pasteur; Department of Cell Biology and Infection; Paris France