Table 1. Iron dissociation constants of E. coli RIC.

RIC	KdRIC-chelator (M)*		KdRIC (M)		Percentage of iron released
	FeII	FeIII	FeII	FeIII	FeII	FeIII
As-isolated	30±13×10−6	29±5×10−6	4±1×10−13	4±1×10−27	21±2	74±3
Reduced	151±11×10−6	-	7±1×10−14	-	96±4	-

*Desferrioxamine and 2,2′-dipyridyl were used as chelators of FeIII and FeII, respectively.