Alveoli Organoid (IMAGE) University of Pennsylvania School of Medicine Caption This is an example of AT2 and AT1 epithelial cell generation in a lung alveolar organoid used to examine MANC and AMP function. Green staining for surfactant protein C indicates AT2 cells whereas red staining for Hopx indicates AT1 cells. Credit The lab of Ed Morrisey, PhD, Perelman School of Medicine, University of Pennsylvania 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.