What is the function of intrinsic factor in vitamin B12 absorption?
A) ?It catalyzes release of the vitamin from its protein-bound form.
B) ?It attaches to the vitamin, thereby allowing absorption from the small intestine.
C) ?It acts as a storage protein for the vitamin within the intestinal epithelial cells.
D) ?It acts as a cofactor for mucosal enzymes involved in absorption of the vitamin.
B
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