To identify binding sites for other known transcription factors we used the fasta sequences provided by RegPredict[REF](http://regpredict.lbl.gov/regpredict/help.html), and used those position weight matrices (PSWM) provided by RegulonDB[REF] (http://regulondb.ccg.unam.mx).
The rest of the family members presented a very well conserved 30 bp long region between positions -36 and -75.