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Steve A. Kay, a National Science Foundation-supported researcher from the Scripps Research Institute, studied the circadian biology of a wide range of organisms -- from humans to fruit flies to plants. Pictured here is the bioluminescent plant Arabidopsis thaliana. Bioluminescent organisms ranging from plants to flies (Drosophila) are powerful tools for studying circadian rhythms -- the daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms.
Image credit: Steve A. Kay, The Scripps Research Institute
