1. Department of Morphology (R.H.N.), Institute of Bioscience, São Paulo State University, 18618-970 Botucatu, Brazil
2. Reproductive Biology Group (R.H.N., R.D.V.d.S.M., D.C., P.P.d.W., R.W.S., J.B.), Division of Developmental Biology, Department of Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands
3. Laboratory of Cellular Biology (L.R.d.F.), Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, 31270-901 Belo Horizonte, Brazil