Cells Following a Chemical Trail (VIDEO) Johns Hopkins Medicine 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 In this video, lab-grown human leukemia cells move toward a pipette tip holding an attractive chemical. Credit Yulia Artemenko/Johns Hopkins Medicine Usage Restrictions Permission required. 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.