Immunity tripwire (IMAGE) University of California - San Diego Caption A new study by UC San Diego biologists has revealed insights on the intricate, adaptive mechanisms of a protective system employed by the cells of mammalian immune systems. These defenses have evolved to set a type of tripwire that produces an immune response against attack from viruses. Credit Brian Tsu, Daugherty Lab, UC San Diego Usage Restrictions Must be used in conjunction with eLife paper on immune defenses. 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.