Arabidopsis Seedlings luminescence (IMAGE) Keck School of Medicine of USC Caption Bioluminescent image of Arabidopsis seedlings expressing circadian clock reporter genes in response to water stress.” Credit Dr. Tong Liang/ Kay laboratory, USC Usage Restrictions none 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.