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The cells of the adaptive immune system are characterized by a tremendous amount of receptor gene rearrangements. This generates an infinite repertoire of receptors to recognize any possible pathogen. However, there are a few populations of lymphocytes that do not undergo extensive receptor gene rearrangements and therefore have a limited repertoire of receptors.

Because these populations of lymphocytes have limited diversity in their receptor repertoire, they are better known as
Select Option invariant lymphocytesinnate-like lymphocytesregulatory T-cells
. One such population of T-cells is known as
Select Option $\delta \alpha$$\alpha \beta$$\gamma \delta$
T-cells due to the unique chains that make up their antigen receptor.
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