1 Graduate Physiology Program, North Carolina State University Campus, Box 7608, NC State, Raleigh, NC 27695, USA.
2 Division of Anatomy, Department of Human Morphology and Embryology, Faculty of Medicine, Wroclaw Medical University, Wroclaw 50-368, Poland.
3 Department of Toxicology, Poznan University of Medical Sciences, Poznań 61-701, Poland.
4 Department of Basic and Preclinical Science, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, Torun 87-100, Poland.
5 Division of Histology and Embryology, Department of Human Morphology and Embryology, Faculty of Medicine, Wroclaw Medical University, Wroclaw 50-368, Poland.
6 Physiology Graduate Faculty, North Carolina State University, Raleigh, NC 27607, USA.
7 Institute of Veterinary Medicine, Department of Veterinary Surgery, Nicolaus Copernicus University, Torun 87-100, Poland.
8 Center of Assisted Reproduction, Department of Obstetrics and Gynecology, University Hospital and Masaryk University, Brno 601 77, Czech Republic.
9 Prestage Department of Poultry Science, North Carolina State University, Raleigh, NC 27607, USA.