quaternary structure

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qua·ter·nar·y struc·ture

the three-dimensional arrangement and constitution of a multimeric (that is, containing more than one biopolymer) macromolecule; for example, the α2β2 tetramer of hemoglobin A.

quaternary structure

n.
The three-dimensional arrangement of the macromolecules making up a functional unit, such as that formed by four globin protein molecules to make hemoglobin or by histones interacting with DNA to make a nucleosome.