Immune cell activation in response to SCI (VIDEO) Hong Kong University of Science and Technology This video is under embargo. Please login to access this video. Caption An axon (colored in yellow) is cut off by a ultrafast pulse laser (marked by red arrow) and it shows that the immune cells (colored in green) react quickly and come up to the injury site. Credit HKUST Usage Restrictions N/A License Original 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.