1 Supplementary Information Terminating DNA Tile Assembly with Nanostructured Caps Deepak K. Agrawal 1, † , Ruoyu Jiang 1 , Seth Reinhart 1 , Abdul M. Mohammed 1 , Tyler D. Jorgenson 1, † , Rebecca Schulman 1,2 ,* 1 Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218; 2 Computer Science, Johns Hopkins University, Baltimore, MD 21218 * E-mail: rschulm3@jhu.edu Present address: † Biomedical Engineering Department, Boston University, MA, 02215. Present address: † Molecular Engineering and Sciences Institute, University of Washington, Seattle, WA 98105.