Interferon Response (IMAGE) University of California - San Diego Caption A live-cell visualization of the production of USP18 (green), the inhibitory factor that mediates cell refractorines--or loss of sensitivity--to interferon treatments. The red arrow points to the cell with low USP18 fluorescent reporter expression and the green arrow points to the cell with high USP18 reporter expression. Researchers have designed strategies to enrich the proportion of cells with lower USP18 production and thereby higher responsiveness to interferon. Credit Hao Lab, UC San Diego Usage Restrictions Must be used in conjunction with eLife paper on interferons. 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.