Embryo Development (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 Researchers used a special imaging technique to visualize the location of every nucleus in a lab-generated embryo (left). When exposed to Activin alone, cells along the embryo's border reacted briefly, but did not fully differentiate (right). Credit Laboratory of Stem Cell Biology and Molecular Embryology at The Rockefeller University Usage Restrictions Video may be used only to illustrate the 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.