Development and Functional Properties of Thymic and Extrathymic T Lymphocytes
Bibliographic record
Abstract
Although vertebrate hematopoiesis is known to occur in a variety of locations, the differentiation of T lymphocytes takes place only in the thymus. Conversely, the only known function of the thymus is to produce T lymphocytes. As thymic function progressively diminishes with age in all individuals, and decreased thymic capacity has been linked to an impaired resistance to infections and cancer, increasing thymic function and/or extrathymic T-cell development could thus play an important role in health management in elderly subjects. However, it is currently unclear why the thymus is essential for T-cell development and precisely what is necessary to make a functional T lymphopoietic organ. In this review, we shall discuss the current literature on the similarities and differences between thymic and extrathymic T cells. A major conclusion is that innate T cells can be generated extrathymically, but only the thymus can support the development of classic adaptive T cells. Functional differences between thymic and extrathymic T cells provide a rationale for conservation of the thymus as the sole primary T lymphoid organ. These differences also have implications for the management of thymus involution.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".