1. Dynamics of Macromolecular Assembly Section; Laboratory of Cellular Imaging and Macromolecular Biophysics; National Institute of Biomedical Imaging and Bioengineering; Bethesda Maryland 20892
2. Section on Molecular Structure and Functional Genomics; National Eye Institute, National Institutes of Health; Bethesda Maryland 20892
3. Department of Chemistry and Biochemistry; The Ohio State University; Columbus Ohio 43210