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[1] Without intrinsic factor, dietary B12 cannot be absorbed effectively, leading to deficiency regardless of dietary intake

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Following receptor-mediated endocytosis within lysosomes of peripheral target cells, transcobalamin is degraded, the CD320 receptor is recycled to the plasma membrane, and cobalamin, no longer complexed to a protein, can enter the cytoplasm via lysosomal transporters for utilization by the enzymes methionine synthase (MTR) and L-methylmalonyl-CoA mutase (MUT) (and may even be exported) (179)

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