This bidentate ligand chelates metals via the two phosphine groups. They include gadolinium and manganese chelates, or iron salts for T signal enhancement. The most commonly used intravenous contrast agents are based on chelates of gadolinium. Animals absorb, digest and use mineral chelates better than inorganic minerals. Inorganic sources as moronic acts, metal chelates and triazine dyes. This protoporphyrin molecule chelates with iron in presence of enzyme ferrochelatase to produce Heme. Alternative forms of iron (fumarate, gluconate, chelates) are less irritating and probably better absorbed. The magnesium then chelates to the hydroxyl group and the oxygen atom of nitrile oxide. Two common iron chelates are Fe EDTA and Fe EDDHA. NV038, like other zinc ejector compounds, chelates zinc to remove it from its binding site. The HHCC zinc-finger motif chelates one zinc atom per IN monomer. When the oxalate chelates to a single metal center, it always adopts the planar conformation. During this period, synthetic chelates such as ethylenediaminetetraacetic acid (EDTA) were being developed. The diethyldithiocarbamate ion chelates to many "softer" metals via the two sulfur atoms. As a lectin, it is an antinutrient that chelates minerals.