Neutrophil Follows Chemical Trail (VIDEO) Yale 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 Yale engineers use holographic optical tweezers to manipulate a microparticle, which mimics a bacterium by emitting a bacterial chemical "scent." The neutrophil cell follows the chemical trail to track down the intruder. Credit Eric Dufresne and Holger Kress/Yale University Usage Restrictions Video may be used with appropriate credit given. 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.