This is our human Coriana gonadotropin, or HCG. Now, this is a glycoprotein and that means it's water soluble, it can easily dissolve in the blood and it binds onto the membrane of our plasma cells, of our target cells, plasma membrane, and it basically creates some type of response inside that cell. Now, there are two important functions of our human corianic, natotropin, and this hormone is released as soon as our zygote actually implants onto the endometrium of the uterus of the mother. Now, there are two important purposes. Firstly, it basically stimulates the corpus luteum found in the ovary to release progesterone and estrogen until the placenta can actually take over that job and begin releasing these hormones on its own. And this is required to basically maintain the development of the endometrium during the process of pregnancy.