Unipotent Germline Stem Cells (IMAGE) Max-Planck-Gesellschaft Caption These are unipotent germline stem cells (fluorescent green) in the sperm duct of a mouse testis. Credit Image: MPI Münster / Kinarm Ko 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.