The Natural Killer Cell Engine (IMAGE) Trinity College Dublin Caption A visualization of the natural killer cell engine and how the protein Srebp, works as a switch. Credit Dr. David Finlay, Trinity College Dublin. 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.