Figure 8: Ovarian steroidogenic pathways. Solid lines are major pathways. Dashed lines are minor pathways. Dotted line represents route only available after luteinization. Double lines represent intercellular steroid traffic. Underlined steroids are major secretion products. 3βHSD2: 3-β-hydroxysteroid dehydrogenase 2; 17βHSD1: 17-β-hydroxysteroid dehydrogenase 1; AKR1C3: aldo-keto reductase family 1 member C3; CYP11A1: cholesterol side-chain cleavage enzyme; CYP17A1: 17α-hydroxylase/17,20 lyase; CYP19: aromatase; DHEA: dehydroepiandrosterone; StAR: Acute Steroidogenic Regulatory Protein.