A method is described for the isolation of E. coli mutants impaired in systems for carbohydrate uptake. One such mutant, impaired in a component of the phosphotransferase specific for the uptake of glucos-amine (ptsX), has been used to establish the order zwf edd kga kdgR ptsX fadD of genes located at about min. 36 on the chromosome.
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Jones‐Mortimer et al. (1976) studied this question.
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