<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Iron Chelation involves non-covalent coordination bonding between iron and an organic chemical, often as part of an enzyme or protein complex, as in the iron-binding porphyrin group of hemoglobin.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>