Dynamic DNA in Male Drosophila Germ Stem Cells (video) Howard Hughes Medical Institute Share Print E-Mail Loading video... Caption In fruit flies, repeating genetic elements shrink with age, but then expand in future generations, a resurgence that may help explain how some cells stay immortal. Credit Stephanie King, Life Sciences Institute, University of Michigan Usage Restrictions Please use with credit. 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.