The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
An Activity from Mammalian Cells That Untwists Superhelical DNA—A Possible Swivel For DNA Replication
Open accessAbstract
Nuclei from secondary mouse-embryo cells contain an activity capable of untwisting closed-circular DNAs containing either negative or positive superhelical turns. The activity has no apparent effect on a closed-circular DNA containing no superhelical turns, and is not due to the combined action of an endonuclease and polynucleotide ligase. The enzyme apparently acts by introducing a single-strand nick into the DNA, forming a DNA-enzyme complex that allows the strands to rotate relative to the helix axis before reversing the reaction and sealing the break. The enzyme might possibly serve as a swivel during DNA replication.
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
Burton, K. (1956) · Biochemical Journal · doi:10.1042/bj0620315 · Cited by 14,090
Cited by
Cook, P. R., & Brazell, I. A. (1975) · Journal of Cell Science · doi:10.1242/jcs.19.2.261 · Cited by 486
Topoisomerases as anticancer targets
Delgado, J. L., Hsieh, C.-M., Chan, N.-L., & Hiasa, H. (2018) · Biochemical Journal · doi:10.1042/bcj20160583 · Cited by 481
New Mechanistic and Functional Insights into DNA Topoisomerases
Chen, S. H., Chan, N.-L., & Hsieh, T.-S. (2013) · Annual Review of Biochemistry · doi:10.1146/annurev-biochem-061809-100002 · Cited by 369
Metadata
- Authors
- Champoux, J. J., & Dulbecco, R.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1972-01
- Volume
- 69
- Issue
- 1
- Pages
- 143-146
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W1994135840
- Cited by
- 346
- References
- 1
- FWCI
- 7.42
- Type
- journal article
- Language
- en
- Open access
- green
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: An Activity from Mammalian Cells That Untwists Superhelical DNA—A Possible Swivel For DNA Replication. https://app.cochat.ai/papers/10.1073/pnas.69.1.143
- The paper
- Champoux, J. J., & Dulbecco, R. (1972). An Activity from Mammalian Cells That Untwists Superhelical DNA—A Possible Swivel For DNA Replication. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.69.1.143
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.