Prolactin

Prolactin (PRL), also known as lactotropin and mammotropin, is a protein that (helps or) has role in enabling mammals to produce milk.

It is (a player or) or has influence in over 300 separate processes in various vertebrates, including humans.^[1] Prolactin (comes from or) is secreted from the pituitary gland. It comes as a response to eating, mating, estrogen treatment, ovulation and nursing.^[2][3]