Immune cells in fly embryos (VIDEO) Institute of Science and Technology Austria This video is under embargo. Please login to access this video. Caption To get to the places they are needed, immune cells (purple) have to overcome obstacle like cell-dense tissues (green). Credit © Maria Akhmanova/ISTA Usage Restrictions - 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.