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aStrain number text is colored for easy identification of derivative gacA mutant background, where green denotes ∆gacA::Km, blue gacA::TnKm, and purple gacA::TnKm sup(ihfAS2) strains
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bSuppressors identified genotypically by superscript “sup” followed in brackets with the gene allele of the identified mutation
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cPosition relative to the first nucleotide of the start codon
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dDUP; duplication; Δ: deletion; + :insertion of single base