1. Molecular Structure Section, Laboratory of Experimental and Computational Biology, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-5677, Polymer Research Center and Chemical Engineering Department, Bogazici University, and TUBITAK Advanced Polymeric Materials Research Center, Bebek 80815, Istanbul, Turkey, and Frederick Cancer Research and Development Center, National Cancer Institute, Science Applications International Corporation, Frederick...