Trophoblast turnover in health and disease
Bibliographic record
Abstract
Within the human placenta the villous trophoblast represents the epithelial covering of the chorionic villi. This layer of trophoblast actively participates in transport processes between mother and fetus and is the surface of the barrier separating maternal and fetal blood. It represents the main site of metabolic and endocrine activities of the placenta. It is comprised of an outer continuous layer without cell borders, the syncytiotrophoblast, beneath which resides a population of proliferating cytotrophoblast cells. Daughter cytotrophoblast cells fuse into the syncytium, while aged nuclei inside syncytial fragments are shed into the maternal circulation (Figure 1). Any process disturbing the balance between proliferation, syncytial fusion or shedding will alter the integrity and function of the layer as a whole, which in turn may impair gas and/or nutrient transfer to the fetus as well as endocrine activities. Trophoblast turnover is thus tightly regulated to ensure normal fetal development.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| 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".