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Alignment of the RIF-binding regions of RNAP β subunits among N. farcinica IFM 10152 (RpoB and RpoB2), N. asteroides IFM 0319T (Nast), and M. tuberculosis H37Rv (Mtub). Amino acid substitutions are represented in reverse color. RIF-binding regions (clusters I and II) are boxed.
