Abstract
CLEAR indications that norethynodrel diminishes the chances of survival of the conceptus have been obtained in the rat1,2. It was therefore conceivable that post-coital administration of the steroid could induce sterility in this species. The possibility seemed well worth investigation, as a similar action in humans would appear to offer efficient alternatives to the present contraceptive application of norethynodrel.
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DAVIS, B. Termination of Pregnancy in the Rat with Norethynodrel. Nature 197, 308–309 (1963). https://doi.org/10.1038/197308a0
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DOI: https://doi.org/10.1038/197308a0
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