Process (IMAGE) Penn State Caption A synthetic tissue releases therapeutic proteins (maroon/yellow) once triggered by metabolites (sandy brown). The metabolites contact with the double-stranded DNA (red/blue) to release the red triggering DNA. The triggering DNA activates the aptamer(cyan)-protein complex to release the protein. Credit Xin Zou/Jinping Lai (Penn State) Usage Restrictions non commercial use only License Licensed 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.