Fig. (5) In vivo metabolism (transmetallation) of MnDPDP following administration of Mn based contrast agents. Mn-DPMP: Manganese dipyridoxyl monophosphate; Mn-PLED: Manganese dipyridoxyl ethylenediamine diacetate; ZnDPDP: Zinc dipyridoxyl diphosphate; ZnDPMP: Zinc dipyridoxyl monophosphate; Zn-PLED: Zinc dipyridoxyl ethylenediamine diacetate.