How many subunits are held together to form the three-dimensional shape of hemoglobin?

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Hemoglobin is a globular protein that exhibits quaternary structure.

It is composed of four polypeptide chains, also known as subunits.

In adult human hemoglobin, these subunits consist of two alpha ( $α$ ) chains and two beta ( $β$ ) chains.

These four subunits are held together by non-covalent interactions to form the functional three-dimensional shape of the hemoglobin molecule.

Answer: Four

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