So we have prolactin inhibitory factor. That's why this is also known as PIF and this actually doesn't stimulate, it inhibits the release of prolactin. Now, as we'll see in the next several lectures prolactin is involved in enabling milk production in females. Among other things. It basically allows the process of lactation to actually take place. Now, the fifth and the 6th hormone is the follicle stimulating hormone and the luteinizing hormone and both of these hormones are involved in the reproductive cycle of the human organism and we'll discuss their roles in more detail when we'll discuss the reproduction cycle.