Mechanisms of distamycin A/DAPI chromosome staining
Why this work is in the frame
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Bibliographic record
Abstract
The molecular mechanism underlying distamycin A-induced differential DAPI fluorescent staining of metaphase chromosomes was studied in Sus scrofa domestica both cytologically, using, besides DAPI, two isomeric derivatives of DAPI (D288.45 and D288.48), and molecularly, by in vitro competitive-binding studies using S. scrofa satellite DNA and synthetic DNA polymers. Significant differences in heterochromatin staining were observed between D288.45 and D288.48. Distinct distamycin A/DAPI bands were obtained with DAPI and D288.45 but not with D288.48. Circular dichroism measurements were performed to characterize the displacement of DAPI from its DNA binding sites by distamycin A and also netropsin. Distamycin A was most effective in displacing DAPI when DAPI was bound to contiguous clusters of AT base pairs and much less effective in displacing DAPI bound to GC or mixed AT/GC base-pair sequences. The results of these competitive-binding studies provide the basis of a molecular explanation of the quenching phenomenon of distamycin A counterstaining on chromosomal DAPI fluorescence.
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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) | 0.000 | 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) | 0.000 | 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