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Magnesium ion, Mg2+. The chlorophyll molecule is called a porphyrin. Hemoglobin and vitamin B12 are also porphyrins. The metal in the center of hemoglobin is iron, Fe2+; in vitamin B12, Cobalt, Co2+

2007-01-17 14:03:01 · answer #1 · answered by steve_geo1 7 · 0 0

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