Frank Porreca, Ph.D. (IMAGE) University of Arizona Health Sciences Caption Frank Porreca, Ph.D., studies mouse neurons as part of his research on pain. Credit Nadia Whitehead, UA College of Medicine - Tucson 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.