Which is the unique isozyme present in the heart?

Which is the unique isozyme present in the heart? Correct Answer CK-MB

The heart muscle contains a special isozyme CK-MB (creatine kinase MB) that is not naturally present in the blood but it is produced when released from the heart muscle weakened by heart attack. Within two hours after the heart attack, the blood level of MB starts to increase. It generally increases 12 to 36 hours after the heart attack and returns to normal levels in 3 to 5 days.
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