1. Vivarium Services, Office of the Campus Veterinarian, Washington State University, Pullman, Washington, USA
2. School of Molecular Biosciences, Center for Reproductive Biology, Washington State University, Pullman, Washington, USA
3. School of Medicine, University of California, San Francisco, California, USA
4. School of Molecular Biosciences, Center for Reproductive Biology, Washington State University, Pullman, Washington, USA. pathunt@wsu.edu