A polypeptide hormone of approximately 25 kDa 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.

Synonyms: Lactogen, Placental, Placental Lactogen, Human, Somatomammotropin, Chorionic, Chorionic Somatomammotropin, Human, Luteotropin, Placental, HCS (Human Chorionic Somatomammotropin), Human Chorionic Somatomammotropin, Pregnancy Associated Plasma Protein D, Choriomammotropin, Lactogen Hormone, Placental, 9035-54-5, Placental Luteotropin, Choriomammotrophin, 0, Human Placental Lactogen, PAPP-D, Placental Lactogen, Chorionic Somatomammotropin, Pregnancy-Associated Plasma Protein D, Mammotropic Hormone, Placental, Lactogen, placental, HPL (Human Placental Lactogen), Placental Mammotropic Hormone