Video (VIDEO) Columbia University Irving Medical Center This video is under embargo. Please login to access this video. Caption Scientists have succeeded in generating a new type of embryonic stem cell that carries a single copy of the human genome, instead of the two copies typically found in normal stem cells. Credit The Azrieli Center/The Hebrew University 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.