Johnston et al. -- <I>Molecular Cell</I> (IMAGE) Thomas Jefferson University Caption This is an illustration and Molecular Cell cover art for "Ecdysone- and NO-mediated gene regulation by competing EcR/Usp and E75A nuclear receptors during Drosophila development." Credit D. Johnston/TJU and <I>Molecular Cell</I> 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.