Radioautographic Localization of <sup>125</sup> I-Atrial Natriuretic Factor Binding Sites in the Brain
Bibliographic record
Abstract
Rats were injected through the carotid artery (cephalad direction) with 18.9 mu Ci of either 125I-Arg 101-Tyr 126 atrial natriuretic factor alone or together with an excess of unlabeled hormone. At 2 min after injection, all rats were fixed in vivo by perfusion and serial sections of the whole brain were processed for light microscope radioautography. The radioautographic reaction produced by 125I-atrial natriuretic factor alone was localized in all circumventricular organs (except the subcommissural organ), the smooth muscle cells and endothelial cells of arteries, arterioles, veins, venules, the endothelial cells of intraparenchymal capillaries and the epithelial cells of the choroid plexus. In rats which received 125I-atrial natriuretic factor plus an excess of unlabeled hormone, the radioautographic reaction was reduced by 70-90%. Binding sites are thus localized in regions of the brain, some of them involved in the central monitoring of blood pressure and osmolarity. In addition, the presence of binding sites in the cerebral vasculature and in the epithelium of the choroid plexus suggests that circulating ANF may play a role in the control of cerebral blood flow and in the production of vertebrospinal fluid.
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How this classification was reachedexpand
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 | 0.001 |
| 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 | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".