1. Department of Structural and Functional Biology; State University of Campinas; Campinas São Paulo Brazil
2. Department of Biology; Univ. Estadual Paulista (UNESP); São José do Rio Preto São Paulo Brazil
3. Department of Histology; Embryology and Cell Biology; Federal University of Goiás; Goiânia Goiás Brazil
4. Department of Morphology; Institute of Biology (IB); Univ. Estadual Paulista - UNESP; Botucatu São Paulo Brazil