Nurse Bees Tending to Brood in the Hive (IMAGE) Washington University in St. Louis Caption Recent work at Washington University in St. Louis suggests that the division of labor in honeybee colonies is controlled by small segments of noncoding RNA called micro-RNAs, or miRNAs. Credit Travis Mohrman Usage Restrictions please credit the photographer 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.