Needs Contributes Lacks
Mother
Placenta
Fetus
Progesterone LDL Cholesterol Adequate synthetic capacityEstrone (for progesterone and estrogens)EstradiolEstriol
3β-hydoxysteroid dehydrogenase(3β-HSD)Aromatase (P-450arom)
Adequate cholesterol capacity17α-hydroxylase (for estrone and estradiole synthesis)17,20-desmolase(for estrone and estradiole synthesis)16α-hydoxylase(for estriol synthesis)
17α-hydroxylase (for estrone and estradiole synthesis)17,20-desmolase(for estrone and estradiole synthesis)16α-hydoxylase(for estriol synthesis)
3β-hydoxysteroid dehydrogenase(3β-HSD)Aromatase (P-450arom)
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