Molecular Weight: 4085.24 Salt Form: TFA Purity: >95% Sequence (3-letter): Ala-Val-Ser-Glu-Ile-Gln-Phe-Nle-His-Asn-Leu-Gly-Lys-His-Leu-Ser-Ser-Nle-Glu-Arg-Val-Glu-Trp-Leu-Arg-Lys-Lys-Leu-Gln-Asp-Val-His-Asn-Tyr-NH2 Sequence (1-letter): AVSEIQF(Nle)HNLGKHLSS(Nle)ERVEWLRKKLQDVHNY-NH2 Storage: -20 ?C or below Parathyroid hormone (PTH) regulates serum calcium levels through its effects in the kidney, intestines, and bones. When serum calcium levels are low, PTH is secreted by the chief cells of the parathyroid gland, stimulating osteoclast activity and bone resorption thus the release of calcium. Parathyroid Hormone [Nle8,18,Tyr34](1-34) amide, bovine is an antagonist of the PTH receptor.