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Clinical Chemistry 34: 398-401, 1988;
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Clinical Chemistry, Vol 34, 398-401, Copyright © 1988 by American Association for Clinical Chemistry

Heterogeneity of serum creatine kinase isoenzyme MM in myocardial infarction: standardization of patterns by use of cord-blood serum

J Williams and T Marshall
Biochemistry Department, General Hospital, Sligo, Ireland.

We investigated serum creatine kinase (CK; EC 2.7.3.2) isoenzyme MM in myocardial infarction, using isoelectric focusing in polyacrylamide gels. As many as 14 sub-band species were detected, and sequential sampling revealed a progressive anodal shift in their distribution. A nomenclature for sub-band typing is proposed. It denotes the major sub- bands as 1 (pl 6.91), 2 (pl 6.65), and 3 (pl 6.35); which are usually detected in sera of normal CK range. Abnormal sub-bands (associated with increases in the concentrations of CK) are denoted as a (pl 7.55), b (pl 7.35), c (pl 7.25), d (pl 7.05), e (pl 6.85), f (pl 6.72), g (pl 6.50), h (pl 6.40), i (pl 6.28), j (pl 6.20), and k (pl 6.15). Cord- blood sera gave highly reproducible CK-MM patterns characterized by prominent detection of sub-bands 1-3 and faint detection of c, e, f, g, h, i, and j. It is recommended as a standard for CK-MM sub-band typing.




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Copyright © 1988 by the American Association for Clinical Chemistry.