1. Laboratory of Manipulation of Oocytes and Preantral Follicles (LAMOFOPA), Faculty of Veterinary, State University of Ceará, Fortaleza, CE, Brazil
2. Biotechnology Nucleus of Sobral (NUBIS), Federal University of Ceará, Sobral, CE, Brazil
3. Laboratory of Ultrastructure, CPqAM/FIOCRUZ, Federal University of Pernambuco, Recife-PE, Brazil