Abstract
THE lactic dehydrogenase (LDH) isozymes of tissue homogenates have been found in some cases to exhibit a regularly increasing number of subbands progressing from isozymes 1 to 5 (that is, 1 isozyme 1, 2 subbands of isozyme 2, 3 subbands of isozyme 3, etc.1–4. Such subbands have frequently been interpreted on the basis of a mutant allele, which results in the synthesis of two types of the A subunits, of which isozyme 5 is composed (or of B subunits, of which isozyme 1 is composed, if the order of subbands is reversed). The hybridization of B subunits with two slightly different types of A subunits would account for the subband distributions observed2,3, and the presence of two allelic genes has been supported by genetic evidence3,4.
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