Dual Roles of a Protein (IMAGE) University of Pennsylvania Caption Researchers from Penn and Technical University of Dresden found that the protein Del-1 takes on different functions depending on the cell that secretes it. When secreted by the immune system's macrophages, it acts as a bridge between those cells and neutrophils to help clear inflammation. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.