Editing the Lungs Before Birth (IMAGE) University of Pennsylvania School of Medicine Caption CRISPR-edited lung cells (green) with EGFP fluorescent protein. Many, but not all, are alveolar type 2 cells, the target cell type for STM study. Credit Ed Morrisey, Penn Medicine 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.