Thymic selection.
The ability of T cells to recognize foreign antigens, distinguish them from self antigens, and regulate immune responses depends largely on which of the vast array of different T-cell receptors they display on their surface, the so called T-cell repertoire. Two selection processes, positive and negative selection, operate on developing T cells and allow only a subset of all possible T cells to differentiate. New developments in transgenic mouse technology and the study of T-cell signalling are unravelling these fascinating processes.
Department of Medicine, Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
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Pardoll
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Carrera
D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology*
D011948:Receptors, Antigen, T-Cell