Chris Vassallo, University of Wyoming (IMAGE) University of Wyoming Caption Chris Vassallo, a University of Wyoming doctoral student in the Department of Molecular Biology, performs routine maintenance of bacterial cultures in the lab. Vassallo was lead author of a paper about cell rejuvenation that was published in PNAS May 18. Credit University of Wyoming 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.