Duke University Researchers (IMAGE) Rice University Caption Duke graduate student Larisa Gearhart-Serna, right, and Associate Professor Gayathri Devi of the Duke University School of Medicine oversaw lab experiments on aggressive breast cancer cells that helped reveal the central role of the JAG1 ligand in the cells' differentiation and metastasis. Credit Duke University School of Medicine Usage Restrictions Credit must be used. 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.