Abstract
Early in the history of the thalidomide disaster, chick embryos were "eliminated" as useful in the study of thalidomide. One reason for that conclusion was that many of the early experiments were flawed. We employed a number of experiments to expose chick embryos to thalidomide. Our data show that thalidomide does cause limb reduction defects in chick embryos as long as the embryos are directly exposed to the drug. The most useful techniques are implanting thalidomide-soaked beads into the embryo immediately adjacent to the limb territory or soaking presumptive chick limb territories in thalidomide and then grafting the explants to a host embryo celom. Thalidomide affects the chick limb grafted to a host embryo in a dose response fashion. Furthermore, S-thalidomide and S-EM12 are more teratogenic than R-thalidomide and R-EM12.
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