Used in biomedical research to quantify levels of glycogen phosphorylase isozyme MM in human serum or plasma samples. This assay helps in the assessment of myocardial damage, particularly in cases of acute myocardial infarction, as GP-MM is released into the bloodstream following heart muscle injury. The kit enables high sensitivity and specificity detection, supporting clinical studies and diagnostic development related to cardiac health. It is also utilized in research settings to investigate metabolic disorders involving glycogen metabolism.