Horizontal Compression (IMAGE) University of Pennsylvania School of Medicine Caption Software highlights vertical motion. (Left) Before injection, the forehead shows increased stretch. (Right) After injection, stretch of the forehead is decreased as evidenced by the light blue color being replaced with yellow. Credit Penn Medicine 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.