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Physical and chemical studies on purified imidazolylacetolphosphate: L-glutamate aminotransferase from Salmonella fyphimurium provide evidence suggesting that the enzyme is composed of two nonidentical subunits.This observation was unexpected since the C gene of the histidine operon in S. fyphimurium, which contains the genetic information for the synthesis of this enzyme, appears to be composed of a single complementation unit.
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Martin et al. (1967) studied this question.
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