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Multiple components of Mce1 and Mce4 transporters are reduced in the cell wall of the ΔsecA2 mutant. The M. tuberculosis H37Rv genome contains four mce loci encoding putative lipid transporters. The genomic regions encoding Mce1 and Mce4 transporter components are shown with Open Reading Frames (ORF) colored for significant differences between strains of p < 0.01, as observed by spectral counting. An asterisk above the ORF indicates a difference of at least twofold.
