iron protoporphyrin

i·ron pro·to·por·phy·rin

a protoporphyrin to which an iron atom is complexed, for example, heme.
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Cellular iron is mostly bound within iron protoporphyrin (heme) and iron--sulfur clusters, which serve as enzyme cofactors, or stored within the core of ferritin multimers.
Iron is mostly locked into iron protoporphyrin (heme) and iron-sulfur clusters, which serve as enzyme cofactors.