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Abstract A method of -mediated gene replacement was used to disrupt tufA or tufB on the chromosome of the E. coli K-12 strain MG1655. Both tuf genes, which are almost identical but map in different chromosomal contexts, encode the essential peptide chain elongation factor EF-Tu, one of the most abundant cytoplasmic proteins. Southern analysis confirmed replacement of the chromosomal tufA or tufB gene...
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