During Tumor Development (IMAGE) University of Bonn Caption Macrophages (brown), the scavengers of the immune system, migrate into the diseased tissue (cancer cells: blue) without destroying it. Credit © Karin E. de Visser/the Netherlands Cancer Institute Usage Restrictions This image may be used together with the press release. 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.