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Medical Term:


Pronunciation: me'tal-o-thi'o-nen


Any of a group of small proteins, rich in cysteinyl residues, that is synthesized in the liver and kidney in response to the presence of divalent ions (zinc, mercury, cadmium, copper) and that binds these ions tightly; of importance in ion transport and detoxification; the apoprotein is thionein.

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