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Disappearing Before Dawn

At 10 a.m. on a frigid January, the lights automatically flicker on in a rat room at the University of Wisconsinâ??Madison’s Research Park. Postdoc Erin Hanlon strolls in, still wearing her scarf from the trip to the lab, where she will spend the next hour or so with Telito, a rat. Telito’s cage is tucked away in a television cabinetâ??like enclosure.