The metal ion present in vitamin B12 is ____:

Q. The metal ion present in vitamin B12 is ____:
Answer: Cobalt
Notes: The structure of B12 is based on a corrin ring, which is similar to the porphyrin ring found in heme, chlorophyll, and cytochrome. It contains the biochemically rare element cobalt sitting in the centre of the ring. Also called cobalamin, it is a water-soluble vitamin.

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