<unk>  is a 32 amino acid peptide hormone secreted by parafollicular cells (also known as C cells) of the thyroid (or endostyle) in humans and other chordates. in the ultimopharyngeal body. It acts to reduce blood calcium (Ca2+), opposing the effects of parathyroid hormone (PTH). Its importance in humans has not been as well established as its importance in other animals, as its function is usually not significant in the regulation of normal calcium homeostasis. It belongs to the<unk> -like protein family. Historically<unk>  has also been called thyrocalcitonin.
Calcitonin
Parathyroid hormone-related protein
Parathyroid hormone
Orexin
Thyroglobulin
Leptin
Calcitriol
Adiponectin