Word: warfarin
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Dates: during 1967-1967
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Perhaps still more potent, and still relatively safe, is the anticoagulant drug warfarin. Less than 1/500th of an ounce is enough to make an adult rat die of internal bleeding. Ironically, the brown rats' white kin in laboratories helped University of Wisconsin researchers develop warfarin anticoagulants as lifesavers for men and killers for rats...