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- W2014650854 abstract "Thymocyte maturation depends on interactions with thymic stromal elements expressing major histocompatibility complex (MHC) molecules. Mutant mouse strains lacking MHC class I (beta 2-microglobulin-null) or class II (A beta-null) expression fail to generate normal CD8 or CD4 T-cell populations and provide model systems for reconstitution experiments. We have constructed in vitro chimeras between normal and MHC-deficient thymi to evaluate the efficiency of positive selection. Unexpectedly, the generation of mature single-positive thymocytes was proportional to the fraction of wild-type (i.e., MHC-expressing) stroma over a wide range of chimerism. Similar results were obtained for the development of T-cell receptor-transgenic thymocytes in graded chimeras expressing selecting and nonselecting MHC alleles. These findings are best explained by hypothesizing that positive selection involves a rate-limiting step at which each thymocyte can interact with only one stromal cell niche." @default.
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- W2014650854 date "1994-11-22" @default.
- W2014650854 modified "2023-09-27" @default.
- W2014650854 title "Evidence for a single-niche model of positive selection." @default.
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- W2014650854 doi "https://doi.org/10.1073/pnas.91.24.11694" @default.
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