1.1.1.188 prostaglandin-F synthase conceptus peri- and postimplantation conceptus. Prostaglandin H synthase and prostaglandin E synthase are down-regulated, and prostaglandin G synthase, prostaglandin F synthase and carbonyl reductase/prostaglandin 9-reductase are down-regulated in conceptuses during trophoblasic elongation. After initiation of implantation, expression of prostaglandin G synthase, prostaglandin F synthase and carbonyl reductase/prostaglandin 9-reductase in conceptuses increases and remains higher until days 24-25 of pregnancy 1.1.1.189 prostaglandin-E2 9-reductase conceptus peri- and postimplantation conceptus. Prostaglandin H synthase and prostaglandin E synthase are down-regulated, and prostaglandin G synthase, prostaglandin F synthase and carbonyl reductase/prostaglandin 9-reductase are down-regulated in conceptuses during trophoblasic elongation. After initiation of implantation, expression of prostaglandin G synthase, prostaglandin F synthase and carbonyl reductase/prostaglandin 9-reductase in conceptuses increases and remains higher until days 24-25 of pregnancy 3.5.3.11 agmatinase conceptus - 4.1.1.19 arginine decarboxylase conceptus -