Bioinorganic chemistry studies the role of metals in biology. It is a mix of biochemistry and inorganic chemistry.
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4Fe-4S clusters serve as electron-relays in proteins.
Myoglobin is a prominent subject in bioinorganic chemistry, with particular attention to the iron-heme complex that is anchored to the protein.
Like many antibiotics, monensin-A is an ionophore that tightly bind Na+ (shown in yellow).