Alveolar macrophages (IMAGE) Technische Universität Dresden Caption Alveolar macrophages are the immune cells that specifically live in the lung air sacs, here visible as red dots in an otherwise transparent mouse lung. Credit Sara Gholamhosseinian Najjar and Michaela Burkon Usage Restrictions No 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.