Word: nitrofuran
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Dates: during 1950-1959
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...Researchers at the State University of Iowa seem to have found the perfect contraceptive-for rats. While they were fed nitrofuran compounds (chemicals obtained from oat hulls), male rats produced no spermatozoa, Dr. Warren 0. Nelson reported, but later they recovered their fertility and sired normal young. The University of Texas' Dr. Donald Duncan, edging out on a limb, said nitrofuran "could be the [human] contraceptive of the future...
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