[1] Univ Fed Rural Pernambuco UFRPE, Dept Morphol & Anim Physiol, Recife, PE, Brazil
[2] Rush Univ, Med Ctr, Canc Ctr, Dept Med,Div Hematol Oncol,Dept Immunol & Microbi, Chicago, IL 60612 USA
[3] Univ Fed Minas Gerais, Dept Physiol & Biophys ICB, Belo Horizonte, MG, Brazil