1. Area of Electron Microscopy, Department of Animal Pathology. School of Agronomy and Veterinary National University of Río Cuarto Córdoba Argentina
2. National Scientific and Technical Research Council (CONICET) Buenos Aires Argentina
3. Institute of Cell Biology, Department of Cell Biology, Histology and Embryology, School of Medical Science National University of Córdoba Córdoba Argentina
4. Department of Animal Anatomy, School of Agronomy and Veterinary National University of Río Cuarto Córdoba Argentina
5. Laboratory of Descriptive, Comparative and Experimental Histology and Embriology, School of Veterinary Sciences National University of La Plata Buenos Aires Argentina