1Immunogenetics and molecular biology laboratory, Federal university of Piauí, Brazil
2Department of Biological Sciences, Nature Science Center (CCN), Federal university of Piauí, Brazil
*Corresponding Author:
Adalberto Socorro Da Silva, Immunogenetics and molecular biology laboratory, Federal university of Piauí, Brazil, Tel: +55 86 32155691, Fax: +55 86 32155690 Email: