The DOI matches its Crossref record; 11 of the 11 references it cites were found in a registry or an index.
Free Tryptophan in Plasma and Brain Tryptophan Metabolism
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
The determination of tryptophan in plasma, liver, and urine.
Denckla, W. D., & Dewey, H. K. (1967) · PubMed · Cited by 823
The Specific Binding of l-Tryptophan to Serum Albumin
McMenamy, R. H., & Oncley, J. L. (1958) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(18)49353-2 · Cited by 643
Colorimetric micro-determination of free fatty acids in plasma
Laurell, S., & Tibbling, G. (1967) · Clinica Chimica Acta · doi:10.1016/0009-8981(67)90269-0 · Cited by 446
THE EFFECTS OF PRECURSOR LOADING IN THE CEREBRAL METABOLISM OF 5‐HYDROXYINDOLES
Moir, A. T. B., & Eccleston, D. (1968) · Journal of Neurochemistry · doi:10.1111/j.1471-4159.1968.tb06827.x · Cited by 396
The role of the sympathetic nervous system in the metabolism of free fatty acids
Havel, R. J., & Goldfien, A. (1959) · Journal of Lipid Research · doi:10.1016/s0022-2275(20)39100-8 · Cited by 381
ENDOGENOUS HYPERLIPIDÆMIA INDUCED BY EMOTIONAL STRESS OF RACING DRIVING
Taggart, P. I., & Carruthers, M. E. (1971) · The Lancet · doi:10.1016/s0140-6736(71)92207-0 · Cited by 131
ECCLESTON, D., Ashcroft, G. P., & Crawford, T. B. B. (1965) · Journal of Neurochemistry · doi:10.1111/j.1471-4159.1965.tb06776.x · Cited by 125
Fuller, R. W., & Diller, E. R. (1970) · Metabolism · doi:10.1016/0026-0495(70)90056-9 · Cited by 114
Changes in brain serotonin metabolism associated with fasting and satiation in rats
Pérez-Cruet, J., Tagliamonte, A., Tagliamonte, P., & Gessa, G. L. (1972) · Life Sciences · doi:10.1016/0024-3205(72)90149-x · Cited by 106
Effects of immobilization on rat liver tryptophan pyrrolase and brain 5‐hydroxytryptamine metabolism
Curzon, G., & Green, A. R. (1969) · British Journal of Pharmacology · doi:10.1111/j.1476-5381.1969.tb08507.x · Cited by 99
Self-citation
Cited by
Physiopharmacological interactions between stress hormones and central serotonergic systems
Chaouloff, F. (1993) · Brain Research Reviews · doi:10.1016/0165-0173(93)90005-k · Cited by 493
Physical exercise and brain monoamines: a review.
CHAOULOFF, F. (1989) · Acta Physiologica Scandinavica · doi:10.1111/j.1748-1716.1989.tb08715.x · Cited by 316
van Hall, G., Raaymakers, J. S., Saris, W. H., & Wagenmakers, A. J. (1995) · The Journal of Physiology · doi:10.1113/jphysiol.1995.sp020854 · Cited by 188
Exercise, Serum Free Tryptophan, and Central Fatigue
Fernstrom, J. D., & Fernstrom, M. H. (2006) · The Journal of Nutrition · doi:10.1093/jn/136.2.553s · Cited by 117
Repeated administration of fresh garlic increases memory retention in rats
Haider, S., Naz, N., Khaliq, S., Perveen, T., & Haleem, D. J. (2008) · Journal of Medicinal Food · doi:10.1089/jmf.2006.0229 · Cited by 28
Metadata
- Authors
- KNOTT, P. J., & CURZON, G.
- Venue
- Nature
- Published
- 1972-10
- Volume
- 239
- Issue
- 5373
- Pages
- 452-453
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2079814518
- Cited by
- 377
- References
- 11
- FWCI
- 11.62
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Free Tryptophan in Plasma and Brain Tryptophan Metabolism. https://app.cochat.ai/papers/10.1038/239452a0
- The paper
- KNOTT, P. J., & CURZON, G. (1972). Free Tryptophan in Plasma and Brain Tryptophan Metabolism. Nature. https://doi.org/10.1038/239452a0
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
