Peptide Image (IMAGE) University of Washington Caption This is a stained cross-section of a mouse tumor. In this image, red areas are macrophages, and green indicates the presence of the peptide that can bind with macrophages in cancer cells. Credit Maryelise Cieslewicz, University of Washington Usage Restrictions Photo credit required. 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.