The DOI matches its Crossref record; 59 of the 59 references it cites were found in a registry or an index.
Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage
Open accessAbstract
Recent studies have shown that the polar bear matriline (mitochondrial DNA) evolved from a brown bear lineage since the late Pleistocene, potentially indicating rapid speciation and adaption to arctic conditions. Here, we present a high-resolution data set from multiple independent loci across the nuclear genomes of a broad sample of polar, brown, and black bears. Bayesian coalescent analyses place polar bears outside the brown bear clade and date the divergence much earlier, in the middle Pleistocene, about 600 (338 to 934) thousand years ago. This provides more time for polar bear evolution and confirms previous suggestions that polar bears carry introgressed brown bear mitochondrial DNA due to past hybridization. Our results highlight that multilocus genomic analyses are crucial for an accurate understanding of evolutionary history.
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The text we found for this paper looks like another document, so the self-check wasn’t run.
Citations
Cites
Inference of Population Structure Using Multilocus Genotype Data
Pritchard, J. K., Stephens, M., & Donnelly, P. (2000) · Genetics · doi:10.1093/genetics/155.2.945 · Cited by 33,871
MRBAYES: Bayesian inference of phylogenetic trees.
Huelsenbeck, J. P., & Ronquist, F. (2001) · Bioinformatics · doi:10.1093/bioinformatics/17.8.754 · Cited by 21,937
Detecting the number of clusters of individuals using the software structure: a simulation study
Evanno, G., Regnaut, S., & Goudet, J. (2005) · Molecular Ecology · doi:10.1111/j.1365-294x.2005.02553.x · Cited by 21,540
Excoffier, L., & Lischer, H. E. L. (2010) · Molecular Ecology Resources · doi:10.1111/j.1755-0998.2010.02847.x · Cited by 16,266
DnaSP v5: a software for comprehensive analysis of DNA polymorphism data
Librado, P., & Rozas, J. (2009) · Bioinformatics · doi:10.1093/bioinformatics/btp187 · Cited by 16,147
Excoffier, L., Smouse, P. E., & Quattro, J. M. (1992) · Genetics · doi:10.1093/genetics/131.2.479 · Cited by 13,929
BEAST: Bayesian evolutionary analysis by sampling trees
Drummond, A. J., & Rambaut, A. (2007) · BMC Evolutionary Biology · doi:10.1186/1471-2148-7-214 · Cited by 13,104
Earl, D. A., & vonHoldt, B. M. (2011) · Conservation Genetics Resources · doi:10.1007/s12686-011-9548-7 · Cited by 12,389
jModelTest: Phylogenetic Model Averaging
Posada, D. (2008) · Molecular Biology and Evolution · doi:10.1093/molbev/msn083 · Cited by 10,578
TCS: a computer program to estimate gene genealogies
Clement, M., Posada, D., & Crandall, K. A. (2000) · Molecular Ecology · doi:10.1046/j.1365-294x.2000.01020.x · Cited by 9,844
Flagged first, then by citations
Research works printed but not linked: 2
- B. Li G. Zhang E. Willerslev J. Wang J. Wang Genomic data from the Polar Bear ( Ursus maritimus ) GigaScience doi:10.5524/100008.10.5524/100008 · DOI
- S. Rozen H. Skaletsky in Bioinformatics Methods and Protocols S. Krawetz S. Misener Eds. (Humana Totowa NJ 1999) pp. 365–386.
Cited by
Sorted by citations
Items 201–300 of 309
Nakagome, S., Mano, S., & Hasegawa, M. (2013) · PLoS ONE · doi:10.1371/journal.pone.0078813 · Cited by 4
The Challenge of Brown Bear Management in Hokkaido, Japan
Mano, T., Yamanaka, M., Tsuruga, H., & Sato, Y. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.025 · Cited by 4
Spatial patterns of genetic diversity in eight bear (Ursidae) species
Puckett, E. E., & Davis, I. S. (2021) · Ursus · doi:10.2192/ursus-d-20-00029.2 · Cited by 3
Dufort, M. J., & Barker, F. K. (2013) · Ecology and Evolution · doi:10.1002/ece3.859 · Cited by 4
No need to replace an “anomalous” primate (Primates) with an “anomalous” bear (Carnivora, Ursidae)
Gutiérrez, E. E., & Pine, R. H. (2015) · ZooKeys · doi:10.3897/zookeys.487.9176 · Cited by 4
Evolutionary History of Polar and Brown Bears
Hailer, F., & Welch, A. J. (2016) · Wiley eBooks · doi:10.1002/9780470015902.a0026303 · Cited by 4
Self-citationPopulation genomics of the southern giraffe
Prochotta, D., Winter, S., Fennessy, J., & Janke, A. (2024) · Molecular Phylogenetics and Evolution · doi:10.1016/j.ympev.2024.108198 · Cited by 3
Self-citationGenetic structure of the brown bears ( Ursus arctos ) in Northern Europe
Kopatz, A. (2014) · Cited by 3
Charters, D., Brown, R. P., Abrams, G., Modica, K. D., Pirson, S., Groote, I. D., Ghiraldi, L., & Meloro, C. (2024) · Historical Biology · doi:10.1080/08912963.2024.2377703 · Cited by 3
Population-genomics reveals a dual ancestry of grizzly bears
de Jong, M., Awan, M., Lecomte, N., Puckett, E. E., Crupi, A. P., & Janke, A. (2025) · iScience · doi:10.1016/j.isci.2025.112870 · Cited by 3
Self-citationAnijalg, P., Remm, J., Tammeleht, E., Keis, M., Valdmann, H., & Saarma, U. (2019) · Conservation Genetics · doi:10.1007/s10592-019-01229-6 · Cited by 3
Everson, K. M., Goodman, S. M., & Olson, L. E. (2020) · Molecular Ecology · doi:10.1111/mec.15433 · Cited by 3
Steinmetz, R., Garshelis, D. L., & Choudhury, A. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.005 · Cited by 3
The Concept of Bird Species: Theory and Practice
Koblik, E. A., Red’kin, Y. А., Volkov, S. V., & Александрович, М. А. (2020) · Biology Bulletin · doi:10.1134/s1062359020070079 · Cited by 3
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0009 · Cited by 3
Random mating populations: Hardy–Weinberg Principle
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0005 · Cited by 3
Genetic Variation in Natural Populations
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0003 · Cited by 3
Contribution of hybridization between polar bears and grizzly bears to polar bear extinction
Shafer, C. L. (2023) · Wildlife Letters · doi:10.1002/wll2.12024 · Cited by 3
Investigating the ancestry of putative hybrids: are Arctic fox and red fox hybridizing?
Yannic, G., Statham, M. J., Denoyelle, L., Szor, G., Qulaut, G. Q., Sacks, B. N., & Lecomte, N. (2017) · Polar Biology · doi:10.1007/s00300-017-2126-z · Cited by 3
Effects of Human Disturbance on Brown Bear Behavior
Støen, O., Ordiz, A., Elfström, M., Hertel, A. G., Sahlén, V., Kindberg, J., & Swenson, J. E. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.019 · Cited by 3
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0011 · Cited by 3
Divergence with Genetic Exchange.—M. L. Arnold.
Janke, A. (2016) · Systematic Biology · doi:10.1093/sysbio/syw047 · Cited by 3
Self-citationWang, H., Gao, S., Zheng, J., Liu, Y., Wu, Y., Aliabadian, M., Komdeur, J., Székely, T., zhang, Z., & Chen, D. (2025) · Avian Research · doi:10.1016/j.avrs.2025.100336 · Cited by 2
Conservation Breeding and Restoration
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0021 · Cited by 2
Ancient DNA: Results and prospects (The 30th anniversary)
Druzhkova, A. S., Vorobieva, N. V., Trifonov, V. A., & Graphodatsky, A. S. (2015) · Russian Journal of Genetics · doi:10.1134/s1022795415060046 · Cited by 3
The letters between James Lamont and Charles Darwin on Arctic fauna
Devlin, C. L. (2014) · Polar Record · doi:10.1017/s0032247414000485 · Cited by 2
Polar Bears and Sea Ice Habitat Change
Durner, G. M., & Atwood, T. C. (2017) · Animal welfare · doi:10.1007/978-3-319-46994-2_23 · Cited by 2
Giant Panda (Ailuropoda melanoleuca)
Swaisgood, R. R., McShea, W. M., Wildt, D. E., Hull, V., Zhang, J., Owen, M. A., Zhang, Z., Dvornicky-Raymond, Z. T., Valitutto, M., Li, D., et al. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.007 · Cited by 2
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0015 · Cited by 2
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0007 · Cited by 2
Rode, K. D., Obbard, M. E., Belikov, S., Derocher, A. E., Durner, G. M., Thiemann, G. W., Tryland, M., Letcher, R. J., Meyerson, R., Sonne, C., et al. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.015 · Cited by 2
Ecological and Social Dimensions of Sloth Bear Conservation in Sri Lanka
Ratnayeke, S., & van Manen, F. T. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.029 · Cited by 1
Penteriani, V., & Melletti, M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.001 · Cited by 1
Bear feet with Björn: tarsal evolution in the origin of polar bears
Polly, P. D. (2024) · Annales Zoologici Fennici · doi:10.5735/086.061.0122 · Cited by 1
Cave lion: Isotopes and dietary paleoecology
Bocherens, H., & Kirillova, I. (2024) · Earth history and biodiversity. · doi:10.1016/j.hisbio.2024.100015 · Cited by 1
Bannikova, A. A., Jenkins, P. D., Lebedev, V. S., Pavlova, S. V., Yakushov, V. D., Raspopova, A. A., Zhu, Y., Fang, Y., Sun, Y., & Sheftel, B. I. (2025) · Vertebrate Zoology · doi:10.3897/vz.75.e153115 · Cited by 1
Genetic heritage of the endangered brown bear (Ursus arctos) in Belarus and the Armenian highlands
Homel, K. V., Shpak, A. V., Kheidorova, E. E., Ghazaryan, A., Hayrapetyan, T., Papov, G., Valnisty, A. A., & Nikiforov, M. E. (2025) · Mammalian Biology · doi:10.1007/s42991-025-00533-8 · Cited by 1
van Heteren, A. H., & Luft, A. S. (2025) · Boreas · doi:10.1111/bor.70044 · Cited by 1
Lindahl, A., Lord, E., Chacón-Duque, J. C., Ravasini, F., Meleg, I. N., Xenikoudakis, G., Ersmark, E., Sharif, B., Skoglund, P., van der Valk, T., et al. (2026) · Royal Society Open Science · doi:10.1098/rsos.251947 · Cited by 1
On the use of kernel approximate Bayesian computation to infer population history
Nakagome, S. (2015) · Genes & Genetic Systems · doi:10.1266/ggs.90.153 · Cited by 1
Managing for Interpopulation Connectivity of the World’s Bear Species
Proctor, M. F., Dutta, T., McLellan, B. N., García-Rangel, S., Paetkau, D., Swaisgood, R. R., & Zedrosser, A. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.023 · Cited by 1
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0023 · Cited by 1
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0014 · Cited by 1
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0004 · Cited by 3
Complete Mitochondrial Genomes of Endangered Japanese Birds
Yamamoto, Y., Asai, S., Saitoh, T., Kobayashi, S., Hiraoka, T., Momose, K., Urano, E., Ohta, N., Kakizawa, R., & Yamagishi, S. (2023) · Journal of the Yamashina Institute for Ornithology · doi:10.3312/jyio.55.103 · Cited by 1
Polar Bear Ursus maritimus Phipps, 1774
Aars, J. (2024) · Handbook of the mammals of Europe · doi:10.1007/978-3-319-65038-8_148-1 · Cited by 1
Kumari, R., Prabha, R., RAY, P. K., Dayal, S., Rao, G. T., KAMAL, R. K., CHANDRAN, P. C., Dey, A., Kumar, J., Tripathi, M. K., et al. (2024) · Gene Reports · doi:10.1016/j.genrep.2024.102087 · Cited by 1
Haber, M. H., & Molter, D. J. (2019) · Philosophy Theory and Practice in Biology · doi:10.3998/ptpbio.16039257.0011.012 · Cited by 1
Sun Bear (Helarctos malayanus)
Scotson, L., Frederick, C. A., Officer, K., & Wong, W. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.009 · Cited by 1
Phenotypic Variation in Natural Populations
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0002 · Cited by 1
Viral discovery in captive polar bears (Ursus maritimus)
Tsangaras, K. (2014) · Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver · doi:10.17169/refubium-12634
Scalable Algorithms for Population Genomic Inference
Sheehan, S. (2015) · eScholarship (California Digital Library)
Cahill, J. A., Heintzman, P. D., Harris, K., Teasdale, M. D., Kapp, J. D., Soares, A. E. R., Stirling, I., Bradley, D. G., Edwards, C. J., Kisleika, A. A., et al. (2017) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/154773
Bochkarev, N. A., Зуйкова, Е. И., & Владиславович, П. Д. (2017) · Генетика · doi:10.7868/s0016675817080033
Ecological Kinds and the Units of Conservation
Lean, C. H. (2019) · ANU Open Research (Australian National University) · doi:10.25911/5d7a261999c91
Doko, T., Chen, W., Uno, R., Tamate, H. B., Toxopeus, A. G., Skidmore, A. K., & Fukui, H. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.026 · Cited by 1
Captive Bears in Asia: Implications for Animal Welfare and Conservation
Schmidt-Burbach, J., -i-Abbas, F., & D’Cruze, N. C. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.027 · Cited by 1
Ex SituConservation of Bears: Roles, Status, and Management
Kolter, L., Sergiel, A., Huber, Đ., & Silver, S. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.024
Principles of Human–Bear Conflict Management in Challenging Environments
Can, Ö. E. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.017
Human Dimensions of Asiatic Black Bear Conflicts and Management in Japan
Sakurai, R. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.028
How Is Climate Change Affecting Polar Bears and Giant Pandas?
Songer, M., Atwood, T. C., Douglas, D. C., Huang, Q., Li, R., Pilfold, N. W., Xu, M., & Durner, G. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.022
Penteriani, V., & Melletti, M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.030
Penteriani, V., & Melletti, M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.031
Penteriani, V., & Melletti, M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781108692571.032
Relethford, J. H. (2016) · Wiley eBooks · doi:10.1002/9781119308058.refs
(2019) · Wiley eBooks · doi:10.1002/9781118768853.refs
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0013
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0016
Conservation Genetics in Practice
Taylor, H. R. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0024
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0018
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0017
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0012
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0010
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0008 · Cited by 2
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.003.0022 · Cited by 1
Гимранов, Д. О. (2022) · Biology Bulletin · doi:10.1134/s1062359022070056
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0003
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0009
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0010
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0006
Probability, Statistics, and Coding
Allendorf, F. W., Funk, W. C., Aitken, S. N., Byrne, M. M., & Luikart, G. (2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.005.0001
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0004
(2022) · Oxford University Press eBooks · doi:10.1093/oso/9780198856566.002.0011
Гимранов, Д. О. (2024) · Зоологический журнал · doi:10.31857/s0044513424080088
Threading the Needle: Species Eliminativism Meets Biological Conservation
Odenbaugh, J. (2024) · The British Journal for the Philosophy of Science · doi:10.1086/734470
Zrzavý, J., Burda, H., Štorch, D., Begall, S., & Mihulka, S. (2024) · Springer eBooks · doi:10.1007/978-3-662-68530-3_6
PRIMER REGISTRO DEL PINCHAFLOR DE GARGANTA NEGRA Diglossa brunneiventris (THRAUPIDAE) EN ECUADOR
Pozo-Zamora, G. M., & Guachamín-Paladines, G. (2024) · Revista Ecuatoriana de Ornitología · doi:10.18272/reo.v10i2.3314
Okamoto, T., Okamoto, K., Yamamoto, T., Tao, S.-D., Kurita, K., & Toda, M. (2025) · Genetica · doi:10.1007/s10709-025-00253-4
Polar Bear Ursus maritimus Phipps, 1774
Aars, J. (2025) · Handbook of the mammals of Europe · doi:10.1007/978-3-030-44035-0_148
Pylidis, C., Matic, I., Djan, M., Valchev, K., Ćirović, D., Arangelov, S., Walker, S., Sarasua, N., Mrazek, V., Basuony, A. E., et al. (2025) · Ecology and Evolution · doi:10.1002/ece3.72691
Self-citationBochkarev, N. A. (2025) · Journal of Ichthyology · doi:10.1134/s0032945225600296
Metadata
- Authors
- Hailer, F., Kutschera, V. E., Hallström, B. M., Klassert, D., Fain, S. R., Leonard, J. A., Arnason, U., & Janke, A.
- Affiliations
- Senckenberg - Leibniz Institution for Biodiversity and Earth System Research (DE)
- National Fish and Wildlife Forensic Laboratory, 1490 East Main Street, Ashland, OR, USA.
- Estación Biológica de Doñana (ES)
- Lund University Hospital, Box 117, 221 00 Lund, Sweden.
- Goethe University Frankfurt (DE)
- Corresponding author
- Hailer, Frank
- Janke, Axel
- Venue
- Science
- Published
- 2012-04-20
- Volume
- 336
- Issue
- 6079
- Pages
- 344-347
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2057692000
- Cited by
- 308
- References
- 58
- Citations by year
- 2026: 7 · 2025: 14 · 2024: 13 · 2023: 9 · 2022: 41 · 2021: 22 · 2020: 44 · 2019: 18 · 2018: 7 · 2017: 26 · 2016: 13 · 2015: 25 · 2014: 29 · 2013: 28 · 2012: 12
- FWCI
- 17.98
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- other-oa
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
- ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
- Lund University Publications (Lund University) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Keywords
- polar bear, brown bear, Ursus americanus, nuclear genome, divergence time estimation, speciation, Pleistocene, hybridization, introgression, mitochondrial DNA, Ursus, molecular phylogeny
- MeSH terms
- Animals, Bayes Theorem, Ursidae, Cell Nucleus, DNA, Mitochondrial, Biological Evolution, Haplotypes, Hybridization, Genetic, Molecular Sequence Data, Phylogeny, Genetic Variation, Genome, Genetic Speciation, Gene Flow, Multilocus Sequence Typing
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