Mouse Retina Tissue (IMAGE) NASA/Johnson Space Center Caption This is retina tissue from a normal mouse (A) and after spaceflight (B) indicate oxidative damage, identified with green fluorescence. Nuclei are stained blue. Credit <I>Radiation Research</I> Usage Restrictions with credit to <I>Radiation Research</I> 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.