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TNase induction by the addition of l-cysteine. Total RNA of JM39 was prepared from cells cultivated in LB medium (lane 1) and LB plus 10 mM l-cysteine (lane 2). Each lane was loaded with 20 μg of total RNA. The arrow indicates a tnaC-tnaA transcript of ca. 1.7 kb. The 23S and 16S rRNAs are total RNA-loading controls detected by UV spectrometer.
