Description_x000D_ Amino Acid Sequence_x000D_ Ala-Pro-Leu-Ala-Pro-Arg-Asp-Ala-Gly-Ser-Gln-Arg-Pro-Arg-Lys-Lys-Glu-Asp-Asn-Val-Leu-Val-Glu-Ser-His-Glu-Lys-Ser-Leu-Gly-Glu-Ala-Asp-Lys-Ala-Asp-Val-Asn-Val-Leu-Thr-Lys-Ala-Lys-Ser-Gln_x000D_ Application_x000D_ Parathyroid hormone (PTH) is an 84 amino acid hormone involved in calcium regulation, increases calcium levels in blood, in counteraction to calcitonin. PTH also regulates serum phosphate levels and vitamin D biosynthesis. PTH (39-84) and (53-84) are C-terminal peptides of PTH used to resolve PTH activity.