1. Department of Chemistry, 55 North Eagleville Road, University of Connecticut, Storrs, Connecticut 06269
2. Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892
3. Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
4. Department of Cell Biology, University of Connecticut Health Center, Farmington, Connecticut 06032