1. Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA; University of Nebraska–Omaha, Omaha, Nebraska, USA
2. Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
3. Division of Biochemistry, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA; US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
4. Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA. olockrid@unmc.edu