3-D Stem Cell Visualization (IMAGE) Drexel University Caption Drexel engineers created a program that can stack slices of microscopic time-lapse video in a three-dimensional volume. The one shown here is a cross section of brain tissue that shows stem cells (purple) and surrounding vasculature (red and green). Credit Drexel 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.