
1) Protein
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https://www.crosswordclues.com/clue/ferritin

Ferritin is a ubiquitous intracellular protein that stores iron and releases it in a controlled fashion. The protein is produced by almost all living organisms, including algae, bacteria, higher plants, and animals. In humans, it acts as a buffer against iron deficiency and iron overload. Ferritin is found in most tissues as a cytosolic protein, b...
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http://en.wikipedia.org/wiki/Ferritin

(from the article `chemical compound`) ...proteins and redox metalloenzymes incorporate metal clusters. They are subclasses of the class of proteins known as metalloproteins, which contain ...
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http://www.britannica.com/eb/a-z/f/19

A protein that binds to iron and stores it for use by the body. Ferritin is found in cells in the liver, spleen, bone marrow, and other tissues.
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http://www.cancer.gov/dictionary?expand=F

<protein> An iron storage protein of mammals, found in liver, spleen and bone marrow. ... Morphologically a shell of apoferritin protein with a core of ferrous hydroxide or phosphate. It is much used as an electron dense label in electron microscopy. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(fer´ĭ-tin) the complex of iron and apoferritin, a major form in which iron is stored in the body.
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http://www.encyclo.co.uk/local/21001

An iron storage protein of mammals, found in liver, spleen, and bone marrow. Morphologically a shell of apoferritin (protein) with a core of ferrous hydroxide/phosphate. It is much used as an electron-dense label in electron microscopy.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: fer′i-tin Definitions: 1. An iron-protein complex, containing up to 23% iron, formed by the union of ferric ions with apoferritin; it is found in the intestinal mucosa, spleen, bone marrow, reticulocytes, and liver, and regulates iron storage and transport from the intestinal lumen to plasma. &n...
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http://www.medilexicon.com/medicaldictionary.php?t=32499

Ferritin: The major iron storage protein. The blood level of ferritin serves as an indicator of the amount of iron stored in the body. Ferritin has the shape of a hollow sphere that permits the entry of a variable amount of iron for storage (as ferric hydroxide phosphate complexes). Liver and spleen ferritin consists of 24 subunits of 2 kinds, the ...
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http://www.medterms.com/script/main/art.asp?articlekey=3410

[
n] - a protein containing 20% iron that is found in the intestines and liver and spleen
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http://www.webdictionary.co.uk/definition.php?query=ferritin
noun a protein containing 20% iron that is found in the intestines and liver and spleen; it is one of the chief forms in which iron is stored in the body
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https://www.encyclo.co.uk/local/20974

A form of storage iron.
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https://www.encyclo.co.uk/local/21200
No exact match found.