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methylcobalamin Vitamin B 12 appears to have only two functions in eukaryotes: as a cofactor for the enzymes: Methionine synthase MethylmalonylCoA mutase Sources of vitamin B12 Vitamin B 12 is in the gastrointestinal tract of animals and is then absorbed by the host animal

In mice, secondary tobacco smoke exposure, which is considered a risk factor for COPD [184], increases the density of the NPY nerve fibers in the tracheal smooth muscle [185]

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What are B12 injections and how do they benefit my health