Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: To answer this question, we should know that: It is necessary for the absorption of vitamin B (cobalamin) later on in the ileum of the small intestine.
 The question and answer:
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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 B (cobalamin) later on in the ileum of the small intestine. In humans, the gastric intrinsic factor protein is encoded by the GIF gene.

Based on this passage, which substance facilitates the gastric absorption of vitamin b 12?
The answer is Intrinsic factor ( IF ) , also known as gastric intrinsic factor ( GIF )
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