Abstract

PROTEINS may exist in different molecular forms possessing the same enzymatic activity and which have been called isoenzymes1 or isozymes2. Lactate dehydrogenase has been extensively studied and appears to consist of five isoenzymes, each of which is a tetrameric association of two sub-units, M and H. It has been shown that the synthesis of either sub-unit may be altered in response to hormonal, environmental or neural changes3. Evidence has also been presented which suggests that the synthesis of the two sub-units is controlled by two separate genes4.

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