Polyglutamine (IMAGE) Rice University Caption Simulations at Rice show how a repeating sequence in a mutant protein may trigger Huntington's and other neurological diseases. They confirmed the number of repeats is critical to how many proteins are needed to start an aggregate. Here, 20-and 30-repeat proteins take different forms to nucleate fibers. Credit Mingchen Chen/Rice University Usage Restrictions None 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.