All progestins are not created equal

  title={All progestins are not created equal},
  author={F. Stanczyk},
  • F. Stanczyk
  • Published 2003
  • Biology, Medicine
  • Steroids
  • A variety of progestins are available for therapeutic use. It is convenient to classify them into those related in chemical structure to progesterone or testosterone. Progestins related to progesterone can be subdivided into pregnanes and 19-norpregnanes, whereas those related to testosterone can be subdivided into those with and without a 17-ethinyl group. 17-Ethinylated progestins consist of the families of norethindrone (estranes) and levonorgestrel (13-ethylgonanes). Progestins administered… CONTINUE READING
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