Adenocarcinoma cells (IMAGE) Salk Institute Caption Lung adenocarcinoma tumor cells (green) and macrophages (red) accumulate in the lungs of control mice (left), but expansion of the tumor cells is hindered in macrophage PPARγ knockout mice (right), since the macrophages can’t be metabolically coopted by tumor cells. Cellular cholesterol is visualized in yellow. Credit Salk Institute Usage Restrictions With credit and related coverage License Original 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.