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Gastric Intrinsic Factor & Vitamin B12 Binding Intrinsic factor is a key glycoprotein secreted by gastric parietal cellsessential for the absorption of vitamin B12 in the terminal ileum. Without it, even Intrinsic factor Wikipedia Pernicious Anemia: Definition, Symptoms, Causes & Treatment Pernicious Anemia: What It Is, Causes, Signs, Symptoms, and More Osmosis
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