1. Department of Anatomy, Veterinary Faculty, Campus de Vegazana, Universidad de León, 24007 León, Spain
2. Institute of Biomedicine (IBIOMED), Veterinary Faculty, Campus de Vegazana, Universidad de León, 24007 León, Spain
3. Department of Molecular Biology, Veterinary Faculty, Campus de Vegazana, Universidad de León, 24007 León, Spain