Pili Retraction (IMAGE) Indiana University Caption Clockwise: A bacterium retracts its pili, reeling in a piece of DNA in the environment. This action facilitates "natural transformation," a process by which bacterium acquire new genetic traits, including antibiotic resistance. Credit Image courtesy the Dalia Lab, Indiana University Usage Restrictions Credit Indiana University 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.