1. Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
2. The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
3. Nanovaccine Institute, Ames, IA and Omaha, NE, USA
4. Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA, USA