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The porphyrin ligand bonds to Fe which forms the heme complex. When the heme complex binds to a protein, it forms myoglobin where Fe can bind to one oxygen (O2) molecule. To make hemoglobin, four myoglobins can bind together.
The heme complex is the porphyrin ligand connected to a Fe2+. With a protein and an O2 attached Fe2+, this will become a myoglobin. Four myoglobin will create the whole hemoglobin. To help you remember it is heme complex > myoglobin > hemoglobin.
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