(IMAGE) Kumamoto University Caption Hematopoietic stem cells isolated from various sources such as bone marrow and umbilical cord blood are differentiated to erythroblasts, immature red blood cells that still hold a nucleus. These cells are then transduced with virus expressing HPV-E6/E7 to be immortalized. Established cell lines can be easily maintained and expanded infinitely. At a desired time, those cells are placed into a different culture condition to mature toward RBCs, which are then used for transfusion. Credit Dr. Kenichi Miharada Usage Restrictions To use this media elsewhere, the authors request that a reference to this release be included. License Original 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.