CK-MB – Creatine kinase (CK) is a dimeric enzyme expressed by various tissues and cell types. In the cells,
the “cytosolic” CK enzymes consist of two subunits, which can be either B (brain type) or M (muscle
type). There are three different isoenzymes: CK-MM, CK-BB and CK-MB.
The primary source of CKMB is myocardium although it is also found in skeletal muscle. CKMB
levels increase with myocardial damage.