Crossed (Evolutionary) Signals? (IMAGE) U.S. National Science Foundation Caption An illustration of a choanoflagellate. Researchers have discovered that these single-cell organisms are unique in that they contain molecules that cells in multi-cellular organisms use to communicate with each other. These findings provide new insights into how multi-cellular organisms evolved and they suggest other uses for these communication molecules that have yet to be discovered. Credit Mateus Zica Usage Restrictions None 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.