Natural killer cells at work (IMAGE) Medical University of South Carolina Caption Effect on the response of natural killer (NK) cells of compound 2 against SH-SY5Y NB cells transfected with GFP. NK cells are stained red. Cells were treated with 50 ng mL−1 of recombinant ch14.18 IL-2 and 1 μM of each analogue for 90 minutes. The image shows NB cells (green) being destroyed by NK cells (red). Black bodies in the image are dead SHSY5Y-GFP cells. Credit Images were produced on a Biotek Cytation 5 cell imager. Usage Restrictions use with credit 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.