Fly sperm (IMAGE) Rockefeller University Caption RNA sequencing data from fruit fly testes showing the marked difference between older sperm-related cells (teal, at left) and younger ones (pink, at right). Credit Laboratory of Evolutionary Genetics and Genomics Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. License Original 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.