Whereas hemoglobin is the carrier of oxygen, myoglobin stores oxygen in the tissues. Like hemoglobin, it also contains a noncovalently bound heme group. The molecule of myoglobin consists of a single polypeptide chain with molecular weight of 16,000 and sequence analysis shows that it has similarities with hemoglobin. Following myocardial infraction myoglobin is lost from cardiac muscle cells and its presence in serum may be used as a diagnostic indicator.
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