| AKR | aldo-keto reductase |
| CTB | cytotrophoblast |
| CYP | cytochrome P450 |
| DHEA | dehydroepiandrosterone |
| HSD | hydroxysteroid dehydrogenase |
| SPE | solid phase extraction |
| SRD | steroid 5α-reductase |
| STB | syncytiotrophoblast |
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