New Lung Cells (IMAGE) Weizmann Institute of Science Caption New lung cells are continuously created to replace the damaged ones: Lung tissue six weeks after stem cell transplantation (left) and 16 weeks after transplantation (right). Cells that originated in the transplanted stem cells are green, as opposed to the uncolored host lung cells. Photon-2 microscope image Credit Weizmann Institute of Science Usage Restrictions None 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.