**Polyacrylamide Gel Electrophoresis an Important Tool for the Detection and Analysis of Enzymatic Activities by Electrophoretic Zymograms**

Reyna Lucero Camacho Morales, Vanesa Zazueta-Novoa, Carlos A. Leal-Morales, Alberto Flores Martínez, Patricia Ponce Noyola and Roberto Zazueta-Sandoval  *University of Guanajuato México* 
