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Representative spectra for some of the significant features found at higher abundance in the chloroform fraction of rpoB mutant versus WT susceptible M. tuberculosis isolates, which also matched peaks found in the PDIM standard. The retention time for these peaks was 11.32 min. The main differentially significant peaks are indicated by arrows (m/z 797.7 and m/z 823.2). CI22 is the Beijing rpoB mutant.
