TSH-Releasing Hormone (TRH) is released by the hypothalamus and regulates release of TSH in the anterior pituitary.
Prolactin's principal function is promoting milk production in lactating women.
Overexpression of PRL (hyperprolactinemia) can lead to galactorrhea
Both PRL and GH have similiar affinities for the PRL receptor.
Prolactin is a 199 amino acid hormone with 16% homology to growth hormone.