|Cell culture supernatants||80%||73%-91%|
Growth hormone (GH) is a heterogeneous polypeptide consisting of a number of different isoforms and variants. Its secretion from pituitary somatotrophs is pulatile, with low or undetectable basal levels between peaks. GH secretion has a characteristic diurnal pattern with maximal levels recorded during sleep. Growth hormone is a powerful anabolic hormone that stimulates growth, cell reproduction, and cell regeneration in humans and other animals. The actions of GH are mediated by GH receptors (GHR), which are widely distributed among tissues. Mutations in or deletions of the gene lead to growth hormone deficiency and short stature.