Fly Polytene Chromosomes with Ataxin-7 (image) Stowers Institute for Medical Research Caption Ataxin-7, one of several genes associated with neurodegenerative disease, anchors a key enzymatic module to the fruit fly SAGA complex, which helps control gene activity in organisms from yeast to humans. Fly polytene chromosome preparation with Ataxin-7 is shown in green, RNA polymerase in red and DNA in blue. Credit Image courtesy of Dr. Ryan Mohan of Stowers Institute for Medical Research Usage Restrictions None 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.