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Induction of the nitrogen starvation response by MSX: hybridization of RNA isolated from M. smegmatis cells before (t0) and after addition of MSX. t15, 15 min after addition of MSX; t30, 30 min after addition of MSX; t60, 60 min after addition of MSX. (A) Transcription of the glutamine synthetase-encoding glnA gene, as well as amtB and amt1 coding for ammonium uptake systems. (B) Transcription of M. smegmatis glnR.
