the hemX gene were used as negative control regions , respectively , as H-NS does not bind to the hemX gene .
the hemX gene were used as positive control regions , respectively , as H-NS does not bind to the hemX gene .
The proV promoter were used as negative control regions , respectively , as H-NS does not bind to the hemX gene .
The proV promoter were used as positive control regions , respectively , as H-NS does not bind to the hemX gene .