1. Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
2. School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
3. Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
4. Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
5. Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
6. Department of Animal Science, University of Nebraska-Lincoln, Lincoln, Nebraska, USA