Am I reading this correctly? Apparently estradiol in addition to progesterone inhibits 5alpha reductase

https://www.ncbi.nlm.nih.gov/pubmed/1828548
Estradiol exhibited 40.8 +/- 14.2% inhibition at 10(-4) mol/L (P less than .01), whereas ethinyl estradiol at concentrations from 10(-8) to 10(-4) mol/L failed to inhibit 5 alpha-reductase activity.

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