Split-drive flies (image) University of California - San Diego Share Print E-Mail Caption The split-drive system was developed so transgenes could be naturally separated. The top left fly carries three transgenes, the others only carry one. This is seen by the appearance of distinct fluorescent body parts. Credit Gerard Terradas, UC San Diego Usage Restrictions Must be used in conjunction with UC San Diego research on gene drives. Share Print E-Mail 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.