Fig 1. Transcriptional response of Mtb to low environmental [K⁺].

(A and B) qRT-PCR of gene expression in WT grown in K⁺-free 7H9, pH 7, compared to standard 7H9, pH 7, for 4 hours. Upregulated genes are shown in (A), and downregulated genes are shown in (B). Data are shown as means ± SD from 3 technical replicates, representative of 2–3 independent experiments.