Protein Turnover Could Be Clue to Living Longer (video) Salk Institute Share Print E-Mail Loading video... Caption Salk scientists explain why protein turnover could be useful marker for aging. Credit Salk Institute Usage Restrictions with credit and related coverage. Share Print E-Mail 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.