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If your B12 levels are in the intermediate range, your doctor may order other tests that are more sensitive predictors of deficiency than your serum level of the vitamin

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coli K-12

[127] [128] Synthesis [edit] Biosynthesis [edit] Vitamin B 12 is derived from a tetrapyrrolic structural framework created by the enzymes deaminase and cosynthetase which transform aminolevulinic acid via porphobilinogen and hydroxymethylbilane to uroporphyrinogen III