Complementary replication R- and G-band patterns induced by cell blocking at the R-band/G-band transition, a possible regulatory checkpoint within the S phase of the cell cycle
Bibliographic record
Abstract
The characteristic band patterns of replication banding (dynamic banding) were analyzed. High-resolution (550-1,250 bands per haploid genome) G- and R-band patterns were obtained after 5-bromo-2'-deoxyuridine (BrdU) incorporation during early or late S phase. Thymidine-BrdU permutation culture methods, which arrest DNA synthesis at the R-band/G-band transition, allow complementary BrdU substitution. The RBI (R bands by BrdU using immunological staining) and GBI (G bands by BrdU using immunological staining) band patterns were complementary for all chromosomes. There was no overlapping, and every part of each chromosome was positively stained by one of the two banding procedures. Comparative analysis of RBG (R bands by BrdU using Giemsa staining) and RBI band patterns, as well as GBG (G bands by BrdU using Giemsa staining) and GBI band patterns, showed good congruency, displaying a very good band-for-band match. The congruency and complementarity found for these band patterns show that high concentrations of both thymidine and BrdU blocked S-phase progression near the R-band to G-band replication transition within the S phase. They also prove that BrdU incorporation is complementary and, therefore, demonstrate the existence of the R/G transition: a possible regulatory checkpoint within the S phase of the cell cycle.
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How this classification was reachedexpand
Direct model labels (unvalidated)
Per-model category and study-design labels from the labeling rounds. They are machine output, unvalidated, and the disagreement between models ships as data. No study design here is MEDLINE-validated yet.
| Model arm | Categories | Study design | Confidence |
|---|---|---|---|
| gemma | no category Domain: not available · Genre: Empirical About the Canadian research system: no · About a Canadian topic: no | Bench or experimental | low |
| gpt | no category Domain: not available · Genre: Empirical About the Canadian research system: no · About a Canadian topic: no | Bench or experimental | high |
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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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, unvalidatedLabeled directly by 2 models reading the full record.
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".