Oestradiol is a steroid hormone and the strongest of the three naturally-produced oestrogens. It has many functions but primarily acts to mature and maintain the female reproductive system.
Prolactin is a protein known for its role in enabling mammals, namely females, to produce milk.
This is a female sex hormone produced in the ovaries following ovulation and less so by the adrenal glands. It can affect pregnancy, the menstrual cycle, and the growth of parts of the body, e.g. breasts.