Cell (IMAGE) Weizmann Institute of Science Caption Single-celled lining of the intestines under a microscope. Messenger RNA molecules of two different genes (red and green) are located on different sides of the cell nuclei (blue) Credit Weizmann Institute of Science 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.