Biosensor in Bacteria (IMAGE) University of Washington Caption This image is the first visualization of a second messenger through a biosensor in bacteria, which are much smaller than animal or plant cells. Credit Matthias Christen Usage Restrictions For use by news media, education institutions, and museums 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.