Salk Institute Dravis, Chung, Wahl (IMAGE) Salk Institute Caption To better understand cell "plasticity" in breast cancer, Salk scientists study how different cell types are generated in its tissue of origin, the mammary gland. From left: Christopher Dravis, Chi-Yeh Chung and Geoffrey Wahl, pointing to an image of the mammary gland, showing the different types of cells present in the tissue. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.