1. Department of Animal Morphology and Physiology; Sao Paulo State University-FCAV; Jaboticabal; SP; Brazil
2. Department of Biology; Sao Paulo State University-IBILCE; São José do Rio Pretol; SP; Brazil
3. Department of Physiology; Institute of Bioscience; Sao Paulo State University-UNESP; Botucatu; SP; Brazil