Structures Built with DNA SSTs (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption Single-stranded tiles (SSTs) are interlocking DNA "building blocks" that can be programmed to assemble themselves into precisely designed shapes, including letters, numbers, and emoticons. Credit Wyss Institute at Harvard University Usage Restrictions This image may only be used with appropriate caption or credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.