In E. coli , rcnA , was found to be regulated by Fur .
In E. coli , rcnA expression has also been suggested to be under the control of iron-sensing Fur , implying some interplay of iron homeostasis .
In E. coli , rcnA expression has also been suggested to be under the control of iron-sensing Fur , implying some interplay of cobalt .
In E. coli , rcnA expression has also been suggested to be under the control of iron-sensing Fur , implying some interplay of nickel .