1. Department of Biochemistry and Molecular Genetics; School of Medicine; University of Colorado Denver; Aurora Colorado 80224
2. WR Wiley Environmental Molecular Sciences Laboratory; High Filed NMR Facility, Richland; Washington 99532
3. National High Magnetics Field Laboratory; Tallahassee Florida 32310
4. Department of Chemistry; University of Cambridge; Cambridge CB2 1EW United Kingdom
5. Department of Chemistry and Biochemistry; University of Colorado at Boulder; Boulder Colorado 80309