Explain lactate dehydrogenase, Biology

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Lactate dehydrogenase (LDH) is one of the important enzymes in glycolysis which catalyzes the interconversion of pyruvate and lactate as follows:

Functional lactate dehydrogenases are tetramers composed of both M and H type subunits. M type subunits are predominantly found in muscle tissue and H type subunits are predominantly found in heart tissue.

(A) How many isozymes (types of functional lactate dehydrogenase molecules) of LDH can be found in the body fluids?

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