Tree of Life (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Despite having gone their separate ways at least a billion years ago, plants and animals have developed remarkably similar mechanisms for detecting the molecular signatures of infectious organisms. Credit Image courtesy of Tree of Life Web Project Usage Restrictions Tree of Life Project citation 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.