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isoenzyme

Synonyms:
  • isozyme
Biochemistry. One of a group of enzymes catalyzing the same reaction but having different molecular structures and characterized by varying physical, biochemical and immunological properties. In naming isoenzymes, the normal enzyme name is used and numbered on the basis of electrophoretic mobility. Lactate dehydrogenase, existing in 5 different structures (LDH1, LDH2, LDH3, LDH4, and LDH5), is an example of isoenzymes.
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