iPS Cells (IMAGE) RIKEN Caption This image shows iPS cells (green) generated using histone variants TH2A and TH2B and two Yamanaka factors (Oct3/4 and Klf4). Credit RIKEN Usage Restrictions UNDER EMBARGO UNTIL: 12:00 noon EST/ 17:00 GMT on February 6, 2014/ 2:00am JST on February 7, 2014 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.