Liver Stem Cells (IMAGE) University of Pennsylvania School of Medicine Caption Liver stem cells expressing FoxL1 (aqua blue) in an injured mouse liver near the bile duct. The FoxL1-containing stem cells are encircled by liver fibroblasts (royal blue), suggestive of a stem cell niche. Credit Linda Greenbaum, M.D., University of Pennsylvania School of 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.