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Cobalt (Co)
Vitamin B₁₂; transcarboxylase (only in propionic acid bacteria)
Copper (Cu)
Respiration (cytochrome c oxidase); photosynthesis (plastocyanin); some superoxide dismutases
Iron (Fe)ᵇ
Cytochromes; catalases; peroxidases; iron–sulfur proteins; oxygenases; all nitrogenases
Nickel (Ni)
Most hydrogenases; coenzyme F₄₃₀ of methanogens; CO dehydrogenase; urease
Zinc (Zn)
Carbonic anhydrase; alcohol dehydrogenase; nucleic acid (RNA & DNA) polymerases; DNA-binding proteins