An Unexpected Architecture (VIDEO) Rockefeller University 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 Three-dimensional structure of the active DNA helicase, which unzips DNA strands, is bound to the polymerase called Pol epsilon, which copies them. The DNA polymerase epsilon (green) sits on top rather than the bottom of the helicase. Credit Brookhaven National Laboratory Usage Restrictions Video may be used only to illustrate research described in the accompanying release. 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.