Aptamers (IMAGE) Northwestern University Caption Single strands of engineered DNA, called aptamers, bind to a target and then fold to trigger an electrochemical signal. Credit Jonathan Rivnay/Northwestern University Usage Restrictions Add credit License Original content 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.