Intrinsic factor (IF), also known as gastric intrinsic factor (GIF), is a glycoprotein produced by the parietal cells of the stomach. It is necessary for the absorption of vitamin B12 (cobalamin) later on in the small intestine. In humans, the gastric intrinsic factor protein is encoded by the GIF gene. Haptocorrin (also known as HC, R protein, an...
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http://en.wikipedia.org/wiki/Intrinsic_factor
a glycoprotein (i.e., a complex compound containing both polysaccharide and protein components) with which vitamin B12 (cyanocobalamin) must combine ... [4 related articles]
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http://www.britannica.com/eb/a-z/i/34
A mucoprotein normally secreted by the epithelium of the stomach and that binds vitamin B12, the intrinsic factor/B12 complex is selectively absorbed by the distal ileum, though only the vitamin is taken into the cell. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
a glycoprotein secreted by the parietal cells of the gastric glands, necessary for the absorption of cyanocobalamin (vitamin B12). Its absence results in pernicious anemia.
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A mucoprotein normally secreted by the epithelium of the stomach and that binds vitamin B12; the intrinsic factor/B12 complex is selectively absorbed by the distal ileum, though only the vitamin is taken into the cell.
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(IF) Type: Term Definitions: 1. a small mucoprotein (MW about 45,000) secreted by the neck cell of the gastric glands and required for adequate absorption of vitamin B12 and other cobalamins; deficiency results in pernicious anemia. Synonyms: Castle intrinsic factor
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http://www.medilexicon.com/medicaldictionary.php?t=31705
One of two proteins secreted from the lining of the stomach whose sole purpose is (it seems) to cradle B12 in a pre-fitted styrofoam mold and (A) carry it through the Seven Levels of Digestive Hell until it reaches those few absorption sites in the last foot of small intestine that understand its 'Special Needs' (sounds either sexually kinky or the...
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http://www.swsbm.com/ManualsMM/MedHerbGloss2.txt
[
n] - a substance produced by the mucosa of the stomach and intestines that is essential for the absorption of vitamin B12
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http://www.webdictionary.co.uk/definition.php?query=intrinsic%20factor
a glycoprotein, secreted by the gastric mucosa, that is involved in the intestinal absorption of vitamin B.
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https://www.infoplease.com/dictionary/intrinsic-factor
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