Terry J. Kreeger,¹ Glenn D. Del Giudice,¹ Ulysses S. Seal<sup>2

1</sup>Department of Fisheries and Wildlife, University of Minnesota, St. Paul, Minnesota 55108, USA
²Veteran's Administration Medical Center, Research Service, Minneapolis, Minnesota 55417, USA and Departments of Biochemistry and Fisheries and Wildlife, University of Minnesota, St. Paul, Minnesota 55108, USA