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Abstract

A third subunit, the γ chain, of the human interleukin-2 receptor (IL-2R) was identified, and a complementary DNA clone encoding this member of the cytokine receptor family was isolated. The γ chain is necessary for the formation of the high- and intermediate-affinity receptors, which consist of αβγ heterotrimers and βγ heterodimers, respectively. The IL-2R on murine fibroblastoid cells can be internalized after binding IL-2 only if the γ chain is present; α and β are insufficient for internalization. Thus, the γ chain is an indispensable component of the functional IL-2R.

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Science
Volume 257 | Issue 5068
17 July 1992

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Published in print: 17 July 1992

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Toshikazu Takeshita
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Hironobu Asao
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Kiyoshi Ohtani
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Naoto Ishii
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Satoru Kumaki
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Nobuyuki Tanaka
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Hiroshi Munakata
Department of Biochemistry, Tohoku University School of Medicine, Sendai 980, Japan.
Masataka Nakamura
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.
Kazuo Sugamura
Department of Microbiology, Tohoku University School of Medicine, Sendai 980, Japan.

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