More recently , it was shown that leuO expression in E. coli can be activated by the BglJ regulators .
Also , LeuO expression was detected in a phosphate-restricted media ; and recently it was shown that the expression of the leuO gene can be activated by BglJ regulators LeuO HAS SEVERAL FUNCTIONS IN VIVO Even though LeuO is expressed at very low level in standard laboratory conditions , it seems that in-vivo it has a role in bacterial survival .