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Transcriptional analysis of the ndp gene cluster. RT-qPCR analysis of target gene transcripts produced in Sphingomonas melonis TY grown with (gray bars) or without (black bars) nicotine. The expression levels of the ndp genes were normalized to the 16S rRNA and are expressed as fold changes relative to the expression level in cells. The results presented in these histograms are the means of three independent experiments, and error bars indicate the standard error.
