Inflammation-Sensing On/Off Switch in Engineered Bacteria (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption Engineered bacteria not exposed to inflammatory signals do not turn on the memory circuit and thus remain colorless. In the presence of the inflammatory chemical tetrathionate, the memory circuit switches on and colors the engineered bacteria blue. Credit Wyss Institute and Harvard Medical School. Usage Restrictions None 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.