Drs. Zigman and Mani (image) UT Southwestern Medical Center Share Print E-Mail Caption Dr. Jeffrey Zigman, left, and Dr. Bharath Mani led a UT Southwestern study that found a signaling molecule regulates release of the hunger hormone ghrelin. Credit UT Southwestern Medical Center Usage Restrictions With credit line 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.