KRAB Reactivates Target Gene Activity (VIDEO) California Institute of Technology This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Cells that were previously silenced by KRAB vary greatly in the timing of reactivation (turning back on), and in whether they reactivate at all, following the release of KRAB. Once reactivated, however, each cell fully expresses the target gene. Credit L. Bintu, J. Yong, and M.B. Elowitz / Caltech 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.