Bacterial Cell (IMAGE) University of California - Santa Barbara Caption An ultra-small bacterial cell (scale bar is 100 nanometers) is thought to be a relative of the microorganisms that encode diversity-generating retroelements. Credit Birgit Luef, Norwegian University of Science and Technology 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.