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The following model is horse deoxyhaemoglobin(Adapted from PDB 2DHB).
The Iron atom (colored ocher) is coordinated by five nitrogen atoms (colored blue); four from a heme and one from a histidine residue in the protein. When oxidized, an oxygen molecule binds at the opposite side of the histidine as another axial ligand.
The following molecule is triiodothyroxine.
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