**Author details**

Martha Ustarroz-Cano, Marisol López-Ángel, Nelly López-Valdez, Isabel García-Peláez and Teresa I. Fortoul\* Department of Cellular and Tissular Biology, School of Medicine, National Autonomous University of Mexico (UNAM), Mexico City, México

\*Address all correspondence to: fortoul@unam.mx

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
