Cytokine Release (IMAGE) Howard Hughes Medical Institute Caption A potential COVID-19 treatment targets the runaway immune response seen in some severely ill patients. Researchers hope a common prescription drug will block immune cells from releasing excessive quantities of inflammatory signaling molecules called cytokines, depicted here as small purple specks. Credit scientificanimations.com / Wikimedia Commons 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.