<Li> Key: RMRCNWBMXRMIRW - WYVZQNDMSA - L </Li> <Tr> <Th_colspan="2"> (what is this?) (verify) </Th> </Tr> <P> Vitamin B, also called cobalamin, is a water - soluble vitamin that is involved in the metabolism of every cell of the human body: it is a cofactor in DNA synthesis, and in both fatty acid and amino acid metabolism . It is particularly important in the normal functioning of the nervous system via its role in the synthesis of myelin, and in the maturation of developing red blood cells in the bone marrow . </P> <P> Vitamin B is one of eight B vitamins; it is the largest and most structurally complicated vitamin . It consists of a class of chemically related compounds (vitamers), all of which show physiological activity . It contains the biochemically rare element cobalt (chemical symbol Co) positioned in the center of a corrin ring . The only organisms to produce vitamin B are certain bacteria, and archaea . Some of these bacteria are found in the soil around the grasses that ruminants eat; they are taken into the animal, proliferate, form part of their gut flora, and continue to produce vitamin B . </P>

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