The Zen of XEN: insight into differentiation, metabolism and genomic integrity
Bibliographic record
Abstract
Fertilization of the mouse egg takes place in the oviduct, and following rounds of cell divisions the blastocyst forms and is comprised of three cell lineages. The epiblast houses naive or preimplantation embryonic stem cells (ESCs), which express OCT4, NANOG, REX1, and FGF4 1 . Once implanted into the uterine wall, naïve ESCs differentiate towards primed ESCs and continue to express OCT4 and NANOG, alongside FGF5 and T 1 . Collectively, cells of the epiblast give rise to the embryo proper. As for extraembryonic lineages, the trophectoderm, which gives rise to the placenta, is made up of trophoblast stem cells (TSCs)-expressing CDX2 1 . The third lineage consist of cells that form extraembryonic endoderm (XEN), which express GATA4, GATA6, SOX7, and SOX17 2 . XEN cells differentiate into parietal or visceral endoderm cells, and are essential for the survival and patterning of the embryo 2 , 3 . Despite the many studies that have focused on the derivation, maintenance, and differentiation of naïve and primed ESCs, fewer have addressed these in regard to extraembryonic lineages, specifically XEN cells.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".