Strain FeCl3 MIC ( mM ) 3200-100-1600-100 1600-100-1600 Wild-type DpmrAB/vector DpmrAB/ppmrG DpmrAB DpmrAB rfaY DpmrC ugd pmrG DpmrC ugd pmrG rfaY Modification of the Hep ( I ) phosphate with phosphoethanolamine is not required for Fe ( III ) resistance The core region of the LPS has two phosphates : one at Hep ( II ) that is targeted by PmrG ( Fig. 2C ) , and one at Hep ( I ) that can be modified with phosphoethanolamine by the PmrA-activated cptA gene product ( Tamayo et al. , 2005 ) .