Science Seen | Drosophila Devils

Courtesy of Steve Kay
 DROSOPHILA DEVILS: Steve Kay, of the Scripps Research Institute in La Jolla, Calif., added the gene that encodes for luciferase--the enzyme that gives fireflies their glow--to these Drosophila fruit flies. Now he has a glow-in-the-dark genetic marker for his studies of cellular circadian clocks. And a little illumination if the lights go out.

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