In October 2004, just as the clocks were changing in Illinois, the focus of Kevin Keegan's graduate work on circadian clocks was changing, too. Keegan, a PhD student at Northwestern University in Evanston, Ill., was developing computer code to analyze preliminary data coming out of a microarray study to find Drosophila circadian rhythm genes. "On a lark," he decided to test his code on some previous circadian gene-hunting studies.












