Teratoma Test (IMAGE) Cincinnati Children's Hospital Medical Center Caption This microscopic image shows a cross section from a teratoma, generated in the lab by authors of a June 9 study in Stem Cell Reports that tested the quality of induced pluripotent stem cells (iPSCs). Teratomas, benign tumors containing the developing cells of different body parts, allowed researchers to see if the iPSCs could form the body's three basic germ cell lines - endoderm (gut region), ectoderm (epidermis, nerve tissue, etc.) and mesoderm (muscles, blood cells, etc.). This teratoma in this image includes an area with endoderm tissue. Credit Cincinnati Children's 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.