Comprehensive analysis of the mitochondrial DNA diversity in Chinese cattle
Abstract
Complete mitochondrial DNA D-loop sequences of 1105 individuals were used to assess the diversity of maternal lineages of cattle populations in China. In total, 250 taurine and 88 zebu haplotypes were identified. Five main haplogroups-T1a, T2, T3, T4 and T5-were identified in Bos taurus, whereas Bos indicus harbored two haplogroups-I1 and I2. Our results suggest that the distribution of T1a in Asia was concentrated mainly in the northeast region (northeast China, Korea and Japan); haplogroups T2, T3 and T4 were predominant in Chinese cattle; and T5 was sporadically detected in Mongolian and Pingwu cattle. In contrast to the widespread presence of I1, I2 was distributed only in southwestern China (Yunnan-Guizhou Plateau and the Tibet Autonomous Region) and Xinjiang Uygur Autonomous Region. This is the first time that all five taurine haplogroups and two zebu haplogroups have been found in Mongolian cattle. In addition, eight individuals in Tibetan cattle carried the Bos grunniens mtDNA type. The high mtDNA diversity (H = 0.904 ± 0.008) and the weak genetic structure among the 57 Chinese cattle breeds/populations are consistent with their complex historical background, migration route and ecological environment.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
During the late Neolithic (4000-5000 years ago), taurine cattle were introduced to East Asia from West Asia, carrying T3 and the East Asian-specific T4 haplogroups.
“During the late Neolithic (4000–5000 years ago), taurine cattle were introduced to East Asia from West Asia, carrying T3 and the East Asian-specific T4 haplogroups [9,33,55,56,57].”
From The Genomic Landscape of Cattle: Domestication, Dispersal, and Adaptive Evolution (2026) · cites this paper as [56]
Cites
Tamura, K., Peterson, D., Peterson, N., Stecher, G., Nei, M., & Kumar, S. (2011) · Molecular Biology and Evolution · doi:10.1093/molbev/msr121 · Cited by 39,795 · see citing works
DnaSP v5: a software for comprehensive analysis of DNA polymorphism data
Librado, P., & Rozas, J. (2009) · Bioinformatics · doi:10.1093/bioinformatics/btp187 · Cited by 16,045 · see citing works
Median-joining networks for inferring intraspecific phylogenies
Bandelt, H. J., Forster, P., & Rohl, A. (1999) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a026036 · Cited by 11,742 · see citing works
Panova, M., Hollander, J., & Johannesson, K. (2006) · Molecular Ecology · doi:10.1111/j.1365-294x.2006.03067.x · Cited by 2,469 · see citing works
Evidence for Two Independent Domestications of Cattle
Loftus, R. T., MacHugh, D. E., Bradley, D. G., Sharp, P. M., & Cunningham, P. (1994) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.91.7.2757 · Cited by 812 · see citing works
Genetic Evidence for Near-Eastern Origins of European Cattle
Troy, C. S., MacHugh, D. E., Bailey, J. F., Magee, D. A., Loftus, R. T., Cunningham, P., Chamberlain, A. T., Sykes, B. C., & Bradley, D. G. (2001) · Nature · doi:10.1038/35074088 · Cited by 627 · see citing works
Worldwide Patterns of Ancestry, Divergence, and Admixture in Domesticated Cattle
Decker, J. E., McKay, S. D., Rolf, M. M., Kim, J., Molina Alcalá, A., Sonstegard, T. S., Hanotte, O., Götherström, A., Seabury, C. M., Praharani, L., et al. (2014) · PLoS Genetics · doi:10.1371/journal.pgen.1004254 · Cited by 521 · see citing works
Self-citationChen, N., Cai, Y., Chen, Q., Li, R., Wang, K., Huang, Y., Hu, S., Huang, S., Zhang, H., Zheng, Z., et al. (2018) · Nature Communications · doi:10.1038/s41467-018-04737-0 · Cited by 403 · see citing works
Self-citationMitochondrial Genomes of Extinct Aurochs Survive in Domestic Cattle
Achilli, A., Olivieri, A., Pellecchia, M., Uboldi, C., Colli, L., Al-Zahery, N., Accetturo, M., Pala, M., Kashani, B. H., Perego, U. A., et al. (2008) · Current Biology · doi:10.1016/j.cub.2008.01.019 · Cited by 290 · see citing works
On the Origin of Cattle: How Aurochs Became Cattle and Colonized the World
Ajmone‐Marsan, P., Garcia, J. F., & Lenstra, J. A. (2010) · Evolutionary Anthropology Issues News and Reviews · doi:10.1002/evan.20267 · Cited by 287 · see citing works
Zebu Cattle Are an Exclusive Legacy of the South Asia Neolithic
Chen, S., Lin, B.-Z., Baig, M., Mitra, B., Lopes, R. J., Santos, A. M., Magee, D. A., Azevedo, M., Tarroso, P., Sasazaki, S., et al. (2010) · Molecular Biology and Evolution · doi:10.1093/molbev/msp213 · Cited by 248 · see citing works
Mannen, H., Kohno, M., Nagata, Y., Tsuji, S., Bradley, D. G., Yeo, J. S., Nyamsamba, D., Zagdsuren, Y., Yokohama, M., Nomura, K., et al. (2004) · Molecular Phylogenetics and Evolution · doi:10.1016/j.ympev.2004.01.010 · Cited by 187 · see citing works
Genetic Diversity and Origin of Chinese Cattle Revealed by mtDNA D-Loop Sequence Variation
Lai, S.-J., Liu, Y.-P., Liu, Y.-X., Li, X.-W., & Yao, Y.-G. (2006) · Molecular Phylogenetics and Evolution · doi:10.1016/j.ympev.2005.06.013 · Cited by 143 · see citing works
Species Composition and Environmental Adaptation of Indigenous Chinese Cattle
Gao, Y., Gautier, M., Ding, X., Zhang, H., Wang, Y., Wang, X., Faruque, M. O., Li, J., Ye, S., Gou, X., et al. (2017) · Scientific Reports · doi:10.1038/s41598-017-16438-7 · Cited by 112 · see citing works
Maternal and paternal genealogy of Eurasian taurine cattle (Bos taurus)
Kantanen, J., Edwards, C. J., Bradley, D. G., Viinalass, H., Thessler, S., Ivanova, Z., Kiselyova, T., Ćinkulov, M., Popov, R. G., Stojanović, S., et al. (2009) · Heredity · doi:10.1038/hdy.2009.68 · Cited by 107 · see citing works
Origin and Phylogeographical Structure of Chinese Cattle
Lei, C. Z., Chen, H., Zhang, H. C., Cai, X., Liu, R. Y., Luo, L. Y., Wang, C. F., Zhang, W., Ge, Q. L., Zhang, R. F., et al. (2006) · Animal Genetics · doi:10.1111/j.1365-2052.2006.01524.x · Cited by 98 · see citing works
Self-citationThe Origins of Chinese Domestic Cattle as Revealed by Ancient DNA Analysis
Cai, D., Sun, Y., Tang, Z., Hu, S., Li, W., Zhao, X., Xiang, H., & Zhou, H. (2014) · Journal of Archaeological Science · doi:10.1016/j.jas.2013.09.003 · Cited by 85 · see citing works
Self-citationJia, S., Chen, H., Zhang, G., Wang, Z., Lei, C., Yao, R., & Han, X. (2007) · Journal of genetics and genomics/Journal of Genetics and Genomics · doi:10.1016/s1673-8527(07)60056-3 · Cited by 40 · see citing works
Self-citationHistory and population structure of a closed strain of Japanese Black Cattle
Mukai, F., Tsuji, S., Fukazawa, K., Ohtagaki, S., & Nambu, Y. (1989) · Journal of Animal Breeding and Genetics · doi:10.1111/j.1439-0388.1989.tb00239.x · Cited by 40 · see citing works
A new insight into cattle's maternal origin in six Asian countries
Jia, S., Zhou, Y., Lei, C., Yao, R., Zhang, Z., Fang, X., & Chen, H. (2010) · Journal of genetics and genomics/Journal of Genetics and Genomics · doi:10.1016/s1673-8527(09)60035-7 · Cited by 38 · see citing works
Self-citationWhen and how did Bos indicus introgress into Mongolian cattle?
Yue, X., Li, R., Li, L., Zhang, Y., Huang, J., Chang, Z., Dang, R., Lan, X., Chen, H., & Lei, C. (2014) · Gene · doi:10.1016/j.gene.2013.12.066 · Cited by 23 · see citing works
Self-citationKim, J.-H., Lee, S.-S., Kim, S., Choi, S.-B., Kim, S., Lee, C. W., Jung, K.-S., Kim, E. S., Choi, Y.-S., Kim, S., et al. (2016) · Asian-Australasian Journal of Animal Sciences · doi:10.5713/ajas.15.0692 · Cited by 6 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
Xia, X., Zhang, S., Zhang, H., Zhang, Z., Chen, N., Li, Z., HongXia, S., Liu, X., Lyu, S., Wang, X., et al. (2021) · BMC Genomics · doi:10.1186/s12864-020-07340-0 · Cited by 97 · see citing works
Self-citationGlobal dispersal and adaptive evolution of domestic cattle: a genomic perspective
Xia, X., Qu, K., Wang, Y., Sinding, M. S., Wang, F., Hanif, Q., Ahmed, Z., Lenstra, J. A., Han, J., Lei, C., et al. (2023) · Stress Biology · doi:10.1007/s44154-023-00085-2 · Cited by 48 · see citing works
Self-citationWard, J. A., McHugo, G. P., Dover, M. J., Hall, T. J., Ng’ang’a, S. I., Sonstegard, T. S., Bradley, D. G., Frantz, L., Salter‐Townshend, M., & MacHugh, D. E. (2022) · iScience · doi:10.1016/j.isci.2022.104672 · Cited by 45 · see citing works
Xia, X., Achilli, A., Lenstra, J. A., Tong, B., Ma, Y., Huang, Y., Han, J., Sun, Z., Chen, H., Lei, C., et al. (2021) · Heredity · doi:10.1038/s41437-021-00428-7 · Cited by 33 · see citing works
Self-citationAssociation of HSF1 Genetic Variation with Heat Tolerance in Chinese Cattle
Rong, Y., Zeng, M., Guan, X., Qu, K., Liu, J., Zhang, J., Chen, H., Huang, B., & Lei, C. (2019) · Animals · doi:10.3390/ani9121027 · Cited by 32 · see citing works
Self-citationAbundant Genetic Diversity of Yunling Cattle Based on Mitochondrial Genome
Xia, X., Qu, K., Li, F., Jia, P., Chen, Q., Chen, N., Zhang, J., Chen, H., Huang, B., & Lei, C. (2019) · Animals · doi:10.3390/ani9090641 · Cited by 32 · see citing works
Self-citationMannen, H., Yonezawa, T., Murata, K., Noda, A., Kawaguchi, F., Sasazaki, S., Olivieri, A., Achilli, A., & Torroni, A. (2020) · Scientific Reports · doi:10.1038/s41598-020-78040-8 · Cited by 25 · see citing works
Genetic Diversity and Selective Signature in Dabieshan Cattle Revealed by Whole-Genome Resequencing
Guan, X., Zhao, S., Xiang, W., Jin, H., Chen, N., Lei, C., Jia, Y., & Xu, L. (2022) · Biology · doi:10.3390/biology11091327 · Cited by 25 · see citing works
Self-citationMitogenome Diversity and Maternal Origins of Guangxi Cattle Breeds
Xia, X., Huang, G., Wang, Z., Sun, J., Wu, Z., Chen, N., Lei, C., & Hanif, Q. (2019) · Animals · doi:10.3390/ani10010019 · Cited by 22 · see citing works
Self-citationDorji, J., Jagt, C. J. V., Chamberlain, A. J., Cocks, B. G., MacLeod, I. M., & Daetwyler, H. D. (2022) · Scientific Reports · doi:10.1038/s41598-022-09427-y · Cited by 21 · see citing works
Satyanarayana, D. S., Ahlawat, S., Sharma, R., Arora, R., Sharma, A., Tantia, M. S., & Vijh, R. K. (2022) · Gene · doi:10.1016/j.gene.2022.146279 · Cited by 20 · see citing works
Li, J., Zhang, S., Shen, C., Niu, Z., Yang, H., Zhang, K., Liu, Z., Wang, Y., & Lan, X. (2021) · The Journal of Steroid Biochemistry and Molecular Biology · doi:10.1016/j.jsbmb.2021.105833 · Cited by 18 · see citing works
Exploring genetic diversity and phylogenic relationships of Chinese cattle using gene mtDNA 16S rRNA
Yan, L., She, Y., Elzo, M. A., Zhang, C., Fang, X., & Chen, H. (2019) · Archives animal breeding/Archiv für Tierzucht · doi:10.5194/aab-62-325-2019 · Cited by 17 · see citing works
Self-citationLi, G., Luo, J., Chen, S., Hanif, Q., He, D., & Ma, Z. (2021) · Animal Biotechnology · doi:10.1080/10495398.2021.1973018 · Cited by 13 · see citing works
Self-citationSharma, A., Ahlawat, S., Sharma, R., Arora, R., Singh, K. V., Malik, D., Banik, S., SINGH, T. R., & Tantia, M. S. (2023) · Animal Biotechnology · doi:10.1080/10495398.2023.2268683 · Cited by 12 · see citing works
Deleterious protein-coding variants in diverse cattle breeds of the world
Subramanian, S. (2021) · Genetics Selection Evolution · doi:10.1186/s12711-021-00674-7 · Cited by 12 · see citing works
Assessing genomic diversity and selective pressures in Bashan cattle by whole-genome sequencing data
Sun, L., Qu, K., Liu, Y., Ma, X., Chen, N., Zhang, J., Huang, B., & Lei, C. (2021) · Animal Biotechnology · doi:10.1080/10495398.2021.1998094 · Cited by 12 · see citing works
Self-citationTóth, B., Ashrafzadeh, M. R., Khosravi, R., Bagi, Z., Fehér, M., Bársony, P., Kovács, G., & Kusza, S. (2022) · Aquaculture · doi:10.1016/j.aquaculture.2022.738116 · Cited by 10 · see citing works
Yudin, N. S., Yurchenko, A. A., & Larkin, D. M. (2021) · Vavilov Journal of Genetics and Breeding · doi:10.18699/vj21.023 · Cited by 10 · see citing works
Mitogenome Diversity and Evolution of Bos indicus Cattle in India
Sarath Kumar, T., Singh, S., Ganguly, I., & Dixit, S. P. (2025) · Gene · doi:10.1016/j.gene.2024.149096 · Cited by 7 · see citing works
Ahlawat, S., Sharma, U., Arora, R., Sharma, R., Chhabra, P., Singh, K. V., & Vijh, R. (2023) · Gene · doi:10.1016/j.gene.2023.147627 · Cited by 7 · see citing works
Quan, J., Li, Y., Yang, Y., Yang, T., Sha, Y., Cai, Y., Jiao, T., Wu, J., & Zhao, S. (2021) · Global Ecology and Conservation · doi:10.1016/j.gecco.2021.e01903 · Cited by 6 · see citing works
Misrianti, R., Wijaya, S. H., Sumantri, C., & Jakaria, J. (2022) · TURKISH JOURNAL OF VETERINARY AND ANIMAL SCIENCES · doi:10.55730/1300-0128.4216 · Cited by 6 · see citing works
MTOR Variation Related to Heat Resistance of Chinese Cattle
Ning, Q., Qu, K., Hanif, Q., Jia, Y., Cheng, H., Zhang, J., Chen, N., Chen, H., Huang, B., & Lei, C. (2019) · Animals · doi:10.3390/ani9110915 · Cited by 6 · see citing works
Self-citationA novel SNP of TECPR2 gene associated with heat tolerance in Chinese cattle
Ma, X., Liu, Y., Sun, L., Hanif, Q., Qu, K., Liu, J., Zhang, J., Huang, B., & Lei, C. (2021) · Animal Biotechnology · doi:10.1080/10495398.2021.2011305 · Cited by 6 · see citing works
Self-citationMitochondrial DNA: a tool for elucidating molecular phylogenetics and population
Sodhi, M., Sobti, R. C., & Mukesh, M. (2021) · Elsevier eBooks · doi:10.1016/b978-0-323-90583-1.00031-3 · Cited by 5 · see citing works
Diversity of Mitochondrial DNA Haplogroups and Their Association with Bovine Antral Follicle Count
Liu, H., Zhai, J., Wu, H., Wang, J., Zhang, S., Li, J., Niu, Z., Shen, C., Zhang, K., Liu, Z., et al. (2022) · Animals · doi:10.3390/ani12182350 · Cited by 5 · see citing works
Zhao, J., Li, J., Jiang, F., Song, E., Lan, X., & Zhao, H. (2021) · Animals · doi:10.3390/ani11061579 · Cited by 5 · see citing works
Ahlawat, S., Sharma, U., Chhabra, P., Arora, R., Sharma, R., Singh, K. V., & Vijh, R. (2024) · Mammalian Genome · doi:10.1007/s00335-024-10048-1 · Cited by 5 · see citing works
Jin, S., Xia, J., Jia, F., Jiang, L., Wang, X., Liu, X., Liu, X., & Geng, Z. (2022) · Animals · doi:10.3390/ani12213037 · Cited by 4 · see citing works
Maternal Genetic Diversity Analysis of Guanling Cattle by Mitochondrial Genome Sequencing
Xu, L., Wang, X., Wang, H., Wu, J., Zhou, W., Ni, M., Zhang, K., Zhao, Y., & Lin, R. (2024) · Biochemical Genetics · doi:10.1007/s10528-024-10973-5 · Cited by 2 · see citing works
The Genomic Landscape of Cattle: Domestication, Dispersal, and Adaptive Evolution
Liu, Y., Dao, W., Gao, R., Fan, X., Yang, R., & Miao, Y. (2026) · Animals · doi:10.3390/ani16050776 · Cited by 1 · see citing works
Distribution of the variant at AKIRIN2: c.*188G > A in Chinese cattle
Zeng, M., Qu, K., Hanif, Q., Liu, J., Zhang, J., Chen, N., Huang, B., & Lei, C. (2020) · Animal Biotechnology · doi:10.1080/10495398.2020.1803341 · Cited by 1 · see citing works
Self-citationThe distribution of four missense mutations in SPTBN5 gene across native Chinese breeds
Zhou, H., Huang, B., Qu, K., Liu, J., Zhang, J., & Lei, C. (2020) · Animal Biotechnology · doi:10.1080/10495398.2020.1831521 · Cited by 1 · see citing works
Self-citationWang, Y., Li, J., Huang, J. V., Wu, C., Li, L., & Gong, P. (2021) · Medicine · doi:10.1097/md.0000000000024159
Pingcuo, Z., Basang, W., Zhang, Q., Luosang, D., Hua, K., Dawa, Y. L., Zhu, Y., Ba, D., & Suolang, D. J. (2022) · Russian Journal of Genetics · doi:10.1134/s1022795422030103
De, A. K., Sawhney, S., Muthiyan, R., Bhattacharya, D., Ponraj, P., Malakar, D., Sunder, J., Sujatha, T., Kumar, A., Mondal, S., et al. (2022) · PLoS ONE · doi:10.1371/journal.pone.0278681
Geographic distribution of a missense mutation in the KRT38 gene in Chinese indigenous cattle breeds
Chen, J., Liu, X., Liu, J., Zhang, J., Huang, B., & Lei, C. (2024) · Animal Production Science · doi:10.1071/an22455
Self-citationXia, X., Zhang, S., Zhang, H., Zhang, Z., Chen, N., Li, Z., Sun, H., Liu, X., Lyu, S., Wang, X., et al. (2021) · Figshare · doi:10.6084/m9.figshare.13551054
Self-citationMaternal genetic phylogeography analysis of Kyrgyz native cattle
Ayin, A., Masuko, R., Kakutani, N., Kawaguchi, F., Sasazaki, S., Sultankulov, S., Zhunushov, A. T., Nishibori, M., Yonezawa, T., & Mannen, H. (2024) · Animal Science Journal · doi:10.1111/asj.13999
Trung, N. B., & Phuong, P. T. (2024) · Advances in Animal and Veterinary Sciences · doi:10.17582/journal.aavs/2024/12.12.2418.2426
The history of the formation of Siberian black-and-white Holstein cattle (review)
Шатохин, К. С., Нарожных, К. Н., Petrov, A. F., Chechushkova, M. A., Михайловна, Н. В., Efremova, O. V., & Камалдинов, Е. В. (2025) · Agricultural science Euro-North-East · doi:10.30766/2072-9081.2025.26.3.499-518
Cattle Ancestry, Domestication and Carnivores
Campbell, M. O. (2025) · Springer eBooks · doi:10.1007/978-3-031-97363-5_3
Integrated mitogenome and Y chromosome analysis untangles the complex origin of African pigs
Odongo, L. A., Adeola, A. C., Msalya, G. M., Olaniyan, O. F., Njuki, R. N., Mauki, D. H., Ndiema, E., Shi, X., Cai, Z., Yin, T., et al. (2025) · iScience · doi:10.1016/j.isci.2025.114252
Xia, X., Zhang, S., Zhang, H., Zhang, Z., Chen, N., Li, Z., HongXia, S., Liu, X., Lyv, S., Wang, X., et al. (2021) · Figshare · doi:10.6084/m9.figshare.13551051
Self-citationXia, X., Zhang, S., Zhang, H., Zhang, Z., Chen, N., Li, Z., HongXia, S., Liu, X., Lyv, S., Wang, X., et al. (2021) · Figshare · doi:10.6084/m9.figshare.13551048
Self-citationAdditional file 1 of Deleterious protein-coding variants in diverse cattle breeds of the world
Subramanian, S. (2021) · Figshare · doi:10.6084/m9.figshare.16821661
Xia, X., Zhang, S., Zhang, H., Zhang, Z., Chen, N., Li, Z., HongXia, S., Liu, X., Lyv, S., Wang, X., et al. (2021) · Figshare · doi:10.6084/m9.figshare.13551045
Self-citationYan, H., Quan, X., Li, X., Liu, S., Quji, S., Luobu, C., Lei, Z., Li, F., Ma, W., Qi, X., et al. (2026) · Journal of Animal Breeding and Genetics · doi:10.1111/jbg.70062
Self-citationYu, M., Wen, B., Huang, C., Li, W., Hu, S., Wu, D., Li, C., Liang, L., Bao, H., Tian, R., et al. (2026) · Research Square · doi:10.21203/rs.3.rs-10952936/v1
- Authors
- Xia, X., Qu, K., Zhang, G., Jia, Y., Ma, Z., Zhao, X., Huang, Y., Chen, H., Huang, B., & Lei, C.
- Affiliations
- Northwest A&F University (CN)
- Yunnan Academy of Grassland and Animal Science Kunming Yunnan 650212 China
- Jilin Academy of Agricultural Sciences (CN)
- Qinghai University (CN)
- Corresponding author
- Huang, B.
- Lei, C.
- Venue
- Animal Genetics
- Publisher
- Wiley
- Published
- 2018-11-13
- Volume
- 50
- Issue
- 1
- Pages
- 70-73
- ISSN
- 0268-9146 (ISSN-L)
- 1365-2052
- OpenAlex
- W2901422125
- Cited by
- 48
- References
- 22
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 5 · 2023: 4 · 2022: 9 · 2021: 16 · 2020: 3 · 2019: 5
- FWCI
- 3.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Animal Genetics (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (31872317)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
- Keywords
- mitochondrial DNA, D-loop, cattle, maternal lineage, haplogroups, taurine cattle, Bos indicus, yak, Mongolian cattle, Chinese cattle breeds, genetic diversity, population structure, migration history
- MeSH terms
- Animals, Breeding, Cattle, China, DNA, Mitochondrial, Genetics, Population, Haplotypes, Genetic Variation
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