Human Embryonic Stem Cells (IMAGE) Columbia University Irving Medical Center Caption This image shows human embryonic stem cells that have differentiated into type II alveolar lung epithelial cells (green). A large portion of these transformed cells express surfactant protein B (red), which indicates that they are functional type II cells. Credit Sarah Xuelian Huang, Ph.D., at the Columbia Center for Translational Immunology, Columbia University Medical Center 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.