Sandra Rossie, Purdue University (IMAGE) Purdue University Caption Sandra Rossie found that an enzyme blocks a mechanism that can lead to neural cell death. Credit Purdue Agricultural Communication photo/Tom Campbell 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.