Immune Cell (IMAGE) University of California - Los Angeles Caption In this image from a microscopy video, scientists track the activity of NFκB inside the cell as it responds to a stimulus. Credit Brooks Taylor/UCLA 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.