In the human body growth hormone is produced by the pituitary gland. It exists at especially high levels during adolescence when it promotes the growth of tissues, protein deposition and the breakdown of subcutaneous fat stores. Upon maturation endogenous levels of GH decrease, but remain present in the body at a substantially lower level. In the body the actual structure of growth hormone is a sequence of 191 amino acids. Once scientists isolated this hormone, many became convinced it would exhibit exceptional therapeutic properties. It would be especially effective in cases of pituitary deficient dwarfism, the drug perhaps restoring much linear growth if administered during adolescence.