Figure 1From: Human steroidogenesis: implications for controlled ovarian stimulation with exogenous gonadotropinsHuman ovarian steroidogenesis. Dashed arrows show the route of pregnenolone metabolism via the Δ5 pathway. Solid arrows show an alternative route of pregnenolone metabolism beginning with the conversion of pregnenolone to progesterone by the action of 3β-HSD. Adapted from Wickenheisser JK, et al. 2006 [12].Back to article page