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Description
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Intestinal absorption of vitamin B 12 requires successively three different protein molecules: haptocorrin, intrinsic factor and transcobalamin II

doi: 10.1016/j.cgh.2018.10.021 67

Cobalamin, bound to intrinsic factor, can then bind to a receptor complex called cubilin present on the apical membranes of enterocytes in the distal ileum as well as on renal epithelial cells of the nephron in the kidney
