Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706-1396, Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, and Graduate Program in Biochemistry & Structural Biology and Graduate Program in Biophysics, State University of New York at Stony Brook, Stony Brook, New York 11794 (At 2009-11-02)
