Prolactin (PRL) is a protein hormone (closely related to human growth
hormone
[https://blog.drgeoffreysherivf.com/human-growth-hormone-administration-in-ivf-does-it-enhance-eggembryo-quality-and-outcome/])
that is secreted by specialized cells in the anterior part of the
pituitary gland. In addition, the hormone is also produced and
secreted by a broad range of other cells in the body, most prominently
various immune cells, the brain, and the endometrium (lining of t…