1. Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005, Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32306, Abbott Laboratories, GPRD/R418, 200 Abbott Park Road, AP31/L144, Abbott Park, Illinois 60064, Department of Biology, and Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306