Chromoprotein
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A chromoprotein is a conjugated protein that contains a pigmented prosthetic group (or cofactor). A common example is hemoglobin, which contains a heme cofactor, which is the iron-containing molecule that makes oxygenated blood appear red. Other examples of chromoproteins are: myoglobin, cytochromes and flavoproteins.
In hemoglobin: chromoprotein (tetramer MW:4 x 16.125 =64.500) Heme: Fe++ four pyrrol rings.
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