Ryan Barnes, Ph.D. (IMAGE) University of Pittsburgh Caption Ryan Barnes, Ph.D., postdoctoral fellow at the University of Pittsburgh Credit Courtesy of Ryan Barnes. Usage Restrictions For use with embargoed release. License Original 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.