Placental Lactogen is a polypeptide hormone that is produced by the Syncytiotrophoblasts of the Placenta,also known as chorionic somatomammotropin. It has both Growth Hormone and Prolactin activities on growth,lactation,and luteal steroid production. In women,placental lactogen secretion begins soon after implantation and increases to 1 g or more a day in late pregnancy. Placental lactogen is also an insulin antagonist.
Placental Lactogen Bovine is also capable of activating human and other heterologous GH receptors but not ruminat GH receptors.