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calcitonina

A peptide hormone that lowers calcium concentration in the blood. In humans, it is released by thyroid cells and acts to decrease the formation and absorptive activity of osteoclasts. Its role in regulating plasma calcium is much greater in children and in certain diseases than in normal adults.

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Ngành nghề/Lĩnh vực: Archaeology Category: Evolution

ARN ribosomal (ARNr)

The kind of RNA that constitutes the ribosomes and provides the site for translation.