+A **Protein Subunit** is a single, folded [Polypeptide](/wiki/polypeptide) chain that associates with other subunits to form a larger, functional [Protein Complex](/wiki/protein_complex). Each subunit contributes to the overall structure and activity of the multimeric protein.
+## See also
+- [Polypeptide](/wiki/polypeptide)
+- [Protein Complex](/wiki/protein_complex)
+- [Quaternary Structure](/wiki/quaternary_structure)
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