Before revision: However, it is to be noted that the transcriptional control can differ widely between species, in Salmonella typhimurium, for example much influence is exerted by a leucine-responsive regulatory protein and there is no fim S element.
After revision: The transcriptional control can differ widely between species, in Salmonella typhimurium, for example much influence is exerted by a leucine-responsive regulatory protein and there is no fim S element.