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The emb locus has been considered a target for ethambutol (EMB). Substitutions of codon 306 in Mycobacterium tuberculosis embB have been shown to be the most frequent and predictive mutations for EMB resistance; however, recent reports question the biological role of this mutation. We sequenced embB, embC and embR of 44 EMB-resistant M. tuberculosis strains and found that 30/44 (68.1%) strains had...
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