The DOI matches its Crossref record; 82 of the 82 references it cites were found in a registry or an index.
Mapping the Tree of Life: Progress and Prospects
Open accessAbstract
The intent of this article is to provide a critical assessment of our current understanding of life's phylogenetic diversity. Phylogenetic comparison of gene sequences is a natural way to identify microorganisms and can also be used to infer the course of evolution. Three decades of molecular phylogenetic studies with various molecular markers have provided the outlines of a universal tree of life (ToL), the three-domain pattern of archaea, bacteria, and eucarya. The sequence-based perspective on microbial identification additionally opened the way to the identification of environmental microbes without the requirement for culture, particularly through analysis of rRNA gene sequences. Environmental rRNA sequences, which now far outnumber those from cultivars, expand our knowledge of the extent of microbial diversity and contribute increasingly heavily to the emerging ToL. Although the three-domain structure of the ToL is established, the deep phylogenetic structure of each of the domains remains murky and sometimes controversial. Obstacles to accurate inference of deep phylogenetic relationships are both systematic, in molecular phylogenetic calculations, and practical, due to a paucity of sequence representation for many groups of organisms.
Overview
Integrity signals
Registry
Cites
Statistics
Verification
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?
In the citing paper
“The slow evolution of the ssu rRNA gene makes it an excellent choice when comparing diverse species but less useful at differentiating close relatives (Pace, 2009).”
From The Astrobiology Primer v2.0 (2016) · cites this paper as Pace, 2009
Citations
Cites
CONFIDENCE LIMITS ON PHYLOGENIES: AN APPROACH USING THE BOOTSTRAP
Felsenstein, J. (1985) · Evolution · doi:10.1111/j.1558-5646.1985.tb00420.x · Cited by 44,735
RAxML-VI-HPC: maximum likelihood-based phylogenetic analyses with thousands of taxa and mixed models
Stamatakis, A. (2006) · Bioinformatics · doi:10.1093/bioinformatics/btl446 · Cited by 15,582
Evolutionary trees from DNA sequences: A maximum likelihood approach.
Felsenstein, J. (1981) · Journal of Molecular Evolution · doi:10.1007/bf01734359 · Cited by 14,571
Greengenes, a Chimera-Checked 16S rRNA Gene Database and Workbench Compatible with ARB
DeSantis, T. Z., Hugenholtz, P., Larsen, N., Rojas, M., Brodie, E. L., Keller, K., Huber, T., Dalevi, D., Hu, P., & Andersen, G. L. (2006) · Applied and Environmental Microbiology · doi:10.1128/aem.03006-05 · Cited by 10,891
Phylogenetic identification and in situ detection of individual microbial cells without cultivation
Amann, R., Ludwig, W., & SCHLEIFER, K. H. (1995) · Microbiological Reviews · doi:10.1128/mr.59.1.143-169.1995 · Cited by 9,218
Stackebrandt, E. S., & Goebel, B. M. (1994) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/00207713-44-4-846 · Cited by 7,170
Darwin, C. R., Darwin, C. R., & Edmonds & Remnants (1859) · J. Murray eBooks · doi:10.5962/bhl.title.59991 · Cited by 7,020
Pruesse, E., Quast, C., Knittel, K., Fuchs, B. M., Ludwig, W., Peplies, J., & Glöckner, F. O. (2007) · Nucleic Acids Research · doi:10.1093/nar/gkm864 · Cited by 6,682
Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya.
Woese, C. R., Kandler, O., & Wheelis, M. L. (1990) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.87.12.4576 · Cited by 6,128
RNAmmer: consistent and rapid annotation of ribosomal RNA genes
Lagesen, K., Hallin, P., Rødland, E., Stærfeldt, H., Rognes, T., & Ussery, D. (2007) · Nucleic Acids Research · doi:10.1093/nar/gkm160 · Cited by 5,965
Woese, C. R. (1987) · Microbiological Reviews · doi:10.1128/mr.51.2.221-271.1987 · Cited by 5,042
The Ribosomal Database Project: improved alignments and new tools for rRNA analysis
Cole, J. R., Wang, Q., Cardenas, E., Fish, J., Chai, B., Farris, R. J., Kulam-Syed-Mohideen, A. S., McGarrell, D. M., Marsh, T. L., Garrity, G. M., et al. (2008) · Nucleic Acids Research · doi:10.1093/nar/gkn879 · Cited by 4,873
An Empirical Test of Bootstrapping as a Method for Assessing Confidence in Phylogenetic Analysis
Hillis, D. M., & Bull, J. J. (1993) · Systematic Biology · doi:10.1093/sysbio/42.2.182 · Cited by 4,572
Phylogenetic structure of the prokaryotic domain: The primary kingdoms
Woese, C. R., & Fox, G. E. (1977) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.74.11.5088 · Cited by 4,131
Microbial diversity in the deep sea and the underexplored “rare biosphere”
Sogin, M. L., Morrison, H. G., Huber, J. A., Welch, D. B. M., Huse, S. M., Neal, P. R., Arrieta, J. M., & Herndl, G. J. (2006) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0605127103 · Cited by 3,803
An Empirical Test of Bootstrapping as a Method for Assessing Confidence in Phylogenetic Analysis
Hillis, D. M., & Bull, J. J. (1993) · Systematic Biology · doi:10.2307/2992540 · Cited by 3,452
Isolation of an autotrophic ammonia-oxidizing marine archaeon
Könneke, M., Bernhard, A. E., de la Torre, J. R., Walker, C. B., Waterbury, J. B., & Stahl, D. A. (2005) · Nature · doi:10.1038/nature03911 · Cited by 2,864
A Molecular View of Microbial Diversity and the Biosphere
Pace, N. R. (1997) · Science · doi:10.1126/science.276.5313.734 · Cited by 2,797
Self-citationMoore, D. S., Hillis, D. M., Moritz, C. C., & Mable, B. K. (1996) · Copeia · doi:10.2307/1447682 · Cited by 2,372
Haeckel, E. (1866) · De Gruyter eBooks · doi:10.1515/9783110848281 · Cited by 2,124
The Uncultured Microbial Majority
Rappé, M. S., & Giovannoni, S. J. (2003) · Annual Review of Microbiology · doi:10.1146/annurev.micro.57.030502.090759 · Cited by 2,017
Comparative Metagenomics of Microbial Communities
Tringe, S. G., von Mering, C., Kobayashi, A., Salamov, A. A., Chen, K., Chang, H. W., Podar, M., Short, J. M., Mathur, E. J., Detter, J. C., et al. (2005) · Science · doi:10.1126/science.1107851 · Cited by 1,677
Toward Automatic Reconstruction of a Highly Resolved Tree of Life
Ciccarelli, F. D., Doerks, T., von Mering, C., Creevey, C. J., Snel, B., & Bork, P. (2006) · Science · doi:10.1126/science.1123061 · Cited by 1,663
Cannone, J. J., Subramanian, S., Schnare, M. N., Collett, J. R., D'Souza, L. M., Du, Y., Feng, B. Y., Lin, N., Madabusi, L. V., Müller, K. M., et al. (2002) · BMC Bioinformatics · doi:10.1186/1471-2105-3-2 · Cited by 1,614
Molecules as documents of evolutionary history
Zuckerkandl, E., & Pauling, L. C. (1965) · Journal of Theoretical Biology · doi:10.1016/0022-5193(65)90083-4 · Cited by 1,359
A kingdom-level phylogeny of eukaryotes based on combined protein data.
Baldauf, S., Roger, A., Wenk-Siefert, I., & Doolittle, W. (2000) · Science · doi:10.1126/science.290.5493.972 · Cited by 1,243
Darwin, C. R. (1860) · The Crayon · doi:10.2307/25528056 · Cited by 1,168
A review of long-branch attraction
Bergsten, J. (2005) · Cladistics · doi:10.1111/j.1096-0031.2005.00059.x · Cited by 1,162
rrndb: the Ribosomal RNA Operon Copy Number Database
Klappenbach, J., Saxman, P., Cole, J., & Schmidt, T. M. (2001) · Nucleic Acids Res. · doi:10.1093/nar/29.1.181 · Cited by 1,140
The genome of the choanoflagellate Monosiga brevicollis and the origin of metazoans
King, N., Westbrook, M. J., Young, S. L., Kuo, A., Abedin, M., Chapman, J., Fairclough, S., Hellsten, U., Isogai, Y., Letunic, I., et al. (2008) · Nature · doi:10.1038/nature06617 · Cited by 1,139
Microbial Ecology and Evolution: A Ribosomal RNA Approach
Olsen, G. J., Lane, D. J., Giovannoni, S. J., Pace, N. R., & Stahl, D. A. (1986) · Annual Review of Microbiology · doi:10.1146/annurev.mi.40.100186.002005 · Cited by 1,078
Self-citationIncreased Taxon Sampling Greatly Reduces Phylogenetic Error
Zwickl, D. J., & Hillis, D. M. (2002) · Systematic Biology · doi:10.1080/10635150290102339 · Cited by 939
Iwabe, N., Kuma, K., Hasegawa, M., Osawa, S., & Miyata, T. (1989) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.86.23.9355 · Cited by 902
Novel Division Level Bacterial Diversity in a Yellowstone Hot Spring
Hugenholtz, P., Pitulle, C., Hershberger, K. L., & Pace, N. R. (1998) · Journal of Bacteriology · doi:10.1128/jb.180.2.366-376.1998 · Cited by 891
Self-citationExploring prokaryotic diversity in the genomic era.
Hugenholtz, P. (2002) · Genome biology · doi:10.1186/gb-2002-3-2-reviews0003 · Cited by 887
Rasko, D. A., Rosovitz, M. J., Myers, G. S. A., Mongodin, E. F., Fricke, W. F., Gajer, P., Crabtree, J., Sebaihia, M., Thomson, N. R., Chaudhuri, R. R., et al. (2008) · Journal of Bacteriology · doi:10.1128/jb.00619-08 · Cited by 881
Evolution of the vacuolar H+-ATPase: implications for the origin of eukaryotes.
Gogarten, J. P., Kibak, H., Dittrich, P., Taiz, L., Bowman, E. J., Bowman, B. J., Manolson, M. F., Poole, R. J., Date, T., Oshima, T., et al. (1989) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.86.17.6661 · Cited by 781
Dojka, M. A., Hugenholtz, P., Haack, S. K., & Pace, N. R. (1998) · Applied and Environmental Microbiology · doi:10.1128/aem.64.10.3869-3877.1998 · Cited by 755
Self-citationPhylogenetic Meaning of the Kingdom Concept: an Unusual Ribosomal RNA from Giardia lamblia
Sogin, M. L., Gunderson, J. H., Elwood, H. J., Alonso, R. A., & Peattie, D. A. (1989) · Science · doi:10.1126/science.2911720 · Cited by 707
The Early Evolution of Eukaryotes: A Geological Perspective
Knoll, A. H. (1992) · Science · doi:10.1126/science.1585174 · Cited by 684
Perspectives on archaeal diversity, thermophily and monophyly from environmental rRNA sequences.
Barns, S. M., Delwiche, C. F., Palmer, J. D., & Pace, N. R. (1996) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.93.17.9188 · Cited by 661
Self-citationMonophyletic Origins of the Metazoa: an Evolutionary Link with Fungi
Wainright, P. O., Hinkle, G., Sogin, M. L., & Stickel, S. K. (1993) · Science · doi:10.1126/science.8469985 · Cited by 656
Phylogeny estimation: traditional and Bayesian approaches
Holder, M. T., & Lewis, P. O. (2003) · Nature Reviews Genetics · doi:10.1038/nrg1044 · Cited by 648
Interpreting the universal phylogenetic tree
Woese, C. R. (2000) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.97.15.8392 · Cited by 644
Genomic studies of uncultivated archaea
Schleper, C., Jurgens, G., & Jonuscheit, M. (2005) · Nature Reviews Microbiology · doi:10.1038/nrmicro1159 · Cited by 635
Keeling, P. J., Burger, G., Durnford, D. G., Lang, B. F., Lee, R. W., Pearlman, R. E., Roger, A. J., & Gray, M. W. (2005) · Trends in Ecology & Evolution · doi:10.1016/j.tree.2005.09.005 · Cited by 579
Application and Accuracy of Molecular Phylogenies
Hillis, D. M., Huelsenbeck, J. P., & Cunningham, C. (1994) · Science · doi:10.1126/science.8171318 · Cited by 494
Unexpected Diversity and Complexity of the Guerrero Negro Hypersaline Microbial Mat
Ley, R. E., Harris, J. K., Wilcox, J., Spear, J. R., Miller, S. R., Bebout, B. M., Maresca, J. A., Bryant, D. A., Sogin, M. L., & Pace, N. R. (2006) · Applied and Environmental Microbiology · doi:10.1128/aem.72.5.3685-3695.2006 · Cited by 472
Self-citationUniversal trees based on large combined protein sequence data sets
Brown, J. R., Douady, C. J., Italia, M. J., Marshall, W. E., & Stanhope, M. J. (2001) · Nature Genetics · doi:10.1038/90129 · Cited by 381
Genome trees and the tree of life
Wolf, Y. I., Rogozin, I. B., Grishin, N. V., & Koonin, E. V. (2002) · Trends in Genetics · doi:10.1016/s0168-9525(02)02744-0 · Cited by 362
Genotypic Diversity Within a Natural Coastal Bacterioplankton Population
Thompson, J. R., Preheim, S. P., Pharino, C., Klepac‐Ceraj, V., Hunt, D. E., Benoit, J., Sarma-Rupavtarm, R. B., Distel, D. L., & Polz, M. F. (2005) · Science · doi:10.1126/science.1106028 · Cited by 360
Tristan, L., & Stanhope, M. J. (2007) · Genome biology · doi:10.1186/gb-2007-8-5-r71 · Cited by 356
Novel kingdom-level eukaryotic diversity in anoxic environments
Dawson, S. C., & Pace, N. R. (2002) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.062169599 · Cited by 340
Self-citationHugenholtz, P., Tyson, G. W., Webb, R. I., Wagner, A. M., & Blackall, L. L. (2001) · Applied and Environmental Microbiology · doi:10.1128/aem.67.1.411-419.2001 · Cited by 338
The real ‘kingdoms’ of eukaryotes
Simpson, A. G. B., & Roger, A. J. (2004) · Current Biology · doi:10.1016/j.cub.2004.08.038 · Cited by 335
Evolutionary change in 5S RNA secondary structure and a phylogenic tree of 54 5S RNA species.
Hori, H., & Osawa, S. (1979) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.76.1.381 · Cited by 326
The Closest Unicellular Relatives of Animals
Lang, B. F., O'Kelly, C., Nerad, T., Gray, M. W., & Burger, G. (2002) · Current Biology · doi:10.1016/s0960-9822(02)01187-9 · Cited by 326
A Phylogenomic Approach to Bacterial Phylogeny: Evidence of a Core of Genes Sharing a Common HistoryPreprint
Daubin, V., Gouy, M., & Perrière, G. (2002) · Genome Research · doi:10.1101/gr.187002 · Cited by 318
The Protistan Origins of Animals and Fungi
Steenkamp, E. T., Wright, J., & Baldauf, S. L. (2005) · Molecular Biology and Evolution · doi:10.1093/molbev/msj011 · Cited by 311
Molecular Systematics, 2nd ed.
Sperling, F. A. H. (1997) · Annals of the Entomological Society of America · doi:10.1093/aesa/90.6.863 · Cited by 311
Microbial community genomics in the ocean
DeLong, E. F. (2005) · Nature Reviews Microbiology · doi:10.1038/nrmicro1158 · Cited by 299
Evidence from Beta-Tubulin Phylogeny that Microsporidia Evolved from Within the Fungi
Keeling, P. J., Luker, M. A., & Palmer, J. D. (2000) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a026235 · Cited by 299
Hiller, N. L., Janto, B., Hogg, J., Boissy, R., Yu, S., Powell, E., Keefe, R., Ehrlich, N., Shen, K., Hayes, J. D., et al. (2007) · Journal of Bacteriology · doi:10.1128/jb.00690-07 · Cited by 293
Phylogenetic diversity of the intestinal bacterial community in the termite Reticulitermes speratus
Ohkuma, M., & Kudo, T. (1996) · Applied and Environmental Microbiology · doi:10.1128/aem.62.2.461-468.1996 · Cited by 284
Search for a 'Tree of Life' in the thicket of the phylogenetic forest
Puigbò, P., Wolf, Y. I., & Koonin, E. V. (2009) · Journal of Biology · doi:10.1186/jbiol159 · Cited by 279
New Perspective on Uncultured Bacterial Phylogenetic Division OP11
Harris, J. K., Kelley, S. T., & Pace, N. R. (2004) · Applied and Environmental Microbiology · doi:10.1128/aem.70.2.845-849.2004 · Cited by 229
Self-citationBlank, C. E., Cady, S. L., & Pace, N. R. (2002) · Applied and Environmental Microbiology · doi:10.1128/aem.68.10.5123-5135.2002 · Cited by 186
Self-citationBroadly sampled multigene trees of eukaryotes
Yoon, H. S., Grant, J. R., Tekle, Y. I., Wu, M., Chaon, B., Cole, J. C., Logsdon, J. M., Jr., Patterson, D. J., Bhattacharya, D., & Katz, L. A. (2008) · BMC Evolutionary Biology · doi:10.1186/1471-2148-8-14 · Cited by 159
Geissinger, O., Herlemann, D. P. R., Mörschel, E., Maier, U. G., & Brune, A. (2009) · Applied and Environmental Microbiology · doi:10.1128/aem.02697-08 · Cited by 159
Phylogenetic diversity and ecology of environmental Archaea
Robertson, C. E., Harris, J. K., Spear, J. R., & Pace, N. R. (2005) · Current Opinion in Microbiology · doi:10.1016/j.mib.2005.10.003 · Cited by 155
Self-citationPhilippe* and, H., & Germot, A. (2000) · Molecular Biology and Evolution · doi:10.1093/oxfordjournals.molbev.a026362 · Cited by 154
Archaea : evolution, physiology, and molecular biology
Garrett, R. A., & Klenk, H. (2007) · Cited by 150
The EMBL Nucleotide Sequence Database: major new developments
Stoesser, G. (2003) · Nucleic Acids Research · doi:10.1093/nar/gkg021 · Cited by 127
Herlemann, D. P. R., Geissinger, O., Ikeda‐Ohtsubo, W., Kunin, V., Sun, H., Lapidus, A. L., Hugenholtz, P., & Brune, A. (2009) · Applied and Environmental Microbiology · doi:10.1128/aem.02698-08 · Cited by 108
Archaea Molecular and Cellular Biology
Cavicchioli, R. (2007) · Cited by 95
Molecular phylogentic analysis of a bacterial community in Sulphur River, Parker Cave, Kentucky
Angert, E. R., Northup, D. E., Reysenbach, A., Peek, A. S., Goebel, B. M., & Pace, N. R. (1998) · American Mineralogist · doi:10.2138/am-1997-11-1246 · Cited by 93
Self-citationKlenk, H., Meier, T., Durovic, P., Schwass, V., Lottspeich, F., Dennis, P. P., & Zillig, W. (1999) · Journal of Molecular Evolution · doi:10.1007/pl00006496 · Cited by 64
Dalevi, D., Hugenholtz, P., & Blackall, L. L. (2001) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/00207713-51-2-385 · Cited by 56
Darwin, C. R. (1915) · D. Appleton and company eBooks · doi:10.5962/bhl.title.43845 · Cited by 48
Transcription: Mechanism and Regulation
Thomm, M. (2014) · ASM Press eBooks · doi:10.1128/9781555815516.ch6 · Cited by 42
DNA Replication and Cell Cycle
Lao-Sirieix, S.-H., Marsh, V. L., & Bell, S. D. (2014) · ASM Press eBooks · doi:10.1128/9781555815516.ch3 · Cited by 7
Natural History of the Archaeal Domain
Forterre, P., Gribaldo, S., & Brochier‐Armanet, C. (2006) · Archaea · doi:10.1002/9780470750865.ch2 · Cited by 6
Research works printed but not linked: 1
- 10.2138/am-1998-11-1246 · DOI
Cited by
Sorted by citations
Stochastic Community Assembly: Does It Matter in Microbial Ecology?
Zhou, J. Z., & Ning, D. (2017) · Microbiology and Molecular Biology Reviews · doi:10.1128/mmbr.00002-17 · Cited by 2,827
A new view of the tree of life
Hug, L. A., Baker, B. J., Anantharaman, K., Brown, C. T., Probst, A. J., Castelle, C. J., Butterfield, C. N., Hernsdorf, A. W., Amano, Y., Ise, K., et al. (2016) · Nature Microbiology · doi:10.1038/nmicrobiol.2016.48 · Cited by 2,039
Stewart, E. J. (2012) · Journal of Bacteriology · doi:10.1128/jb.00345-12 · Cited by 1,212
Taberlet, P., Bonin, A., Zinger, L., & Coissac, É. (2018) · doi:10.1093/oso/9780198767220.001.0001 · Cited by 1,146
The importance of the viable but non-culturable state in human bacterial pathogens
Li, L., Mendis, N., Trigui, H., Oliver, J. D., & Faucher, S. P. (2014) · Frontiers in Microbiology · doi:10.3389/fmicb.2014.00258 · Cited by 1,040
Metadata
- Authors
- Pace, N. R.
- Affiliations
- University of Colorado Boulder (US)
- Corresponding author
- Pace, Norman R.
- ORCID
- Pace, Norman R.
- Venue
- Microbiology and Molecular Biology Reviews
- Publisher
- American Society for Microbiology
- Published
- 2009-12
- Volume
- 73
- Issue
- 4
- Pages
- 565-576
- ISSN
- 1092-2172 (ISSN-L)
- 1098-5557
- PMC
- PMC2786576
- OpenAlex
- W2139469924
- Cited by
- 286
- References
- 82
- Citations by year
- 2026: 3 · 2025: 11 · 2024: 9 · 2023: 8 · 2022: 4 · 2021: 7 · 2020: 10 · 2019: 16 · 2018: 41 · 2017: 17 · 2016: 19 · 2015: 20 · 2014: 22 · 2013: 35 · 2012: 28
- FWCI
- 1.61
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Microbiology and Molecular Biology Reviews (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Alfred P. Sloan Foundation
- National Institutes of Health
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Protist diversity and phylogeny
- Keywords
- tree of life, phylogenetic diversity, three-domain system, archaea, bacteria, Eukarya, rRNA gene sequences, environmental microorganisms, unculturable microorganisms, microbial identification, deep phylogenetic relationships, molecular phylogeny, microbial diversity
- MeSH terms
- Animals, Archaea, Bacteria, Humans, Phylogeny, RNA, Ribosomal, Genetic Variation, Genome, Biodiversity, Eukaryota
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