1. Department of Biochemistry, Center for Structural Biology, 465 21st Avenue South, 5140 BIOSCI/MRBIII, Vanderbilt University, Nashville, Tennessee 37232-8725, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany, Department of Chemistry and Biochemistry, Florida Atlantic University, 770 Glades Road, Boca Raton, Florida 33431, Division of Clinical Chemistry, Children's Hospital, Steinwiesstrasse 75, Zürich, CH 8032, Switzerland, and Departments of Chemistry and...