background: parathyroid hormone is an 84-amino acid peptide secreted by the parathyroid glands. its physiological role is maintenance of normal serum calcium level and bone remodeling. biological activity of this hormone is related to n-terminal 1-34 amino acids. the recombinant form of hormone (1-34) has been approved for treatment of osteoporosis from 2002. in this study, a novel fusion partn...