1. Department of Histology; Embryology and Cell Biology, Laboratory of Histophysiology, Institute of Biological Sciences, Federal University of Goiás; Goiânia Goiás 74001970 Brazil
2. Department of Biology; Laboratory of Microscopy and Microanalysis, State University of São Paulo - UNESP; Rua Cristóvão Colombo, 2265, São José do Rio Preto São Paulo 15054000 Brazil