The functional, high-affinity interleukin 2 receptor (IL-2R) consists of at least two receptor components, IL-2Rα (p55) and IL-2Rβ (p70-75). The cDNA encoding the murine IL-2Rβ has been ed by using the previously cloned cDNA for human IL-2Rβ as a probe. Analysis of the cDNA revealed that the murine IL-2Rβ shows a marked homology with the human IL-2Rβ and that it is also structurally related to other cytokine receptors such as erythropoietin receptor. The cDNA-directed murine IL-2Rβ formed high-affinity IL-2R in conjunction with the endogenous IL-2Rα in a murine pro-B-cell line and could transduce IL-2-induced growth signal. In mouse lymphoma line EL-4, the IL-2Rβ gene was found to be rearranged by the insertion of the long terminal repeat sequence of an intracisternal A particle, giving rise to constitutive expression of the IL-2Rβ mRNA.