Mouse Sperm Flow-through (IMAGE) Indiana University Caption Phase contrast images of a sperm cell moving down toward the extract wall in response to the extract gradient. The sperm cell in each frame is circled for clarity. Images shown were taken at 0.6 second intervals. Credit Stephen C. Jacobson 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.