Latent homologues for the neural crest as an evolutionary novelty
Why this work is in the frame
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Bibliographic record
Abstract
The neural crest is a craniate synapomorphy and a bona fide evolutionary novelty. Recently, researchers considering intriguingly similar patterns of gene expression, cell behaviors, and embryogenetic processes in noncraniate deuterostomes have suggested that cephalochordates, urochordates, and echinoderms or their ancestors might have possessed cells that were precursors to the neural crest or its constituent cells. To emphasize the caution with which similarities at genetic, cellular, or embryological levels should be interpreted as substantiations for cell, germ layer, or tissue homologies, we present and evaluate additional tantalizing evidence that could be considered as documenting neural crest precursors in precraniates. Furthermore, we propose an evolutionary context--latent homologue--within which these data should be interpreted.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it