Growth hormone is a peptide hormone synthesized in the somatotropic cells of the anterior pituitary gland. It stimulates growth, development, and regeneration. Human growth hormone is a 191 amino acid polypeptide that can be produced recombinantly in E. coli bacteria using recombinant DNA technology. This involves isolating the hGH gene, inserting it into a plasmid vector, and transforming E. coli to produce the hormone. Recombinant hGH is used to treat growth deficiencies and other conditions.