GlnR binding motif in mycobacteria. Sequence logos of putative GlnR cis elements were identified upstream of the M. smegmatis (msmeg), M. tuberculosis (H37rv), M. bovis (bovis), and M. avium (avium) glnA, amtB, and amt1 genes (amt1 is present only in the M. smegmatis genome). The standard code of the Weblogo server is shown in gray scale at the top.