Affiliation: | 1 Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA 2 Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA 3 Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA 4 Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA |