Tumor-associated macrophages (IMAGE) University of Barcelona Caption The new study describes how the activation of the nuclear receptor LXR limits the activity of tumor-associated macrophages to protect the tumor. Credit UNIVERSITY OF BARCELONA Usage Restrictions The image may only be used with appropriate caption or credit. 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.