1. Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
2. Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
3. Department of Chemistry and Biochemistry, California State University Fresno, Fresno, California 93740, United States
4. Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
5. Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
6. Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
7. Department of Surgery, VA Medical Center, Omaha, Nebraska 68105, United States
8. Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States