1. Contribution from the Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, Departments of Surgery and Biomedical Engineering, Emory University School of Medicine, Department of Chemistry, University of Georgia, Athens, Georgia, Department of Chemistry, Emory University, Atlanta, Georgia 30322, CNRS Laboratory of Organic Polymer Chemistry, University Bordeaux, 1 Talence Cedex, France, and School of Chemical and Biomolecular Engineering, Georgia Institute of...