Edited DNA in stem cell nucleus (IMAGE) The Company of Biologists Caption This shows the nucleus holding the DNA in a stem cell from the Berkeley mice. The green and red spots show the DNA that has been edited by this new stem cell-based gene therapy for sickle cell disease. These coloured dots illustrate abnormal gain or loss of DNA segments after editing. Credit Image courtesy of the Weiss lab. Usage Restrictions Credit must be given to the creator. License CC BY 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.