Differential effects of diminished oestrogen and androgen levels on development of skeletal muscle fibres in hypogonadal mice
Open accessAbstract
Androgen and oestrogen hormones influence skeletal muscle size and the characteristics of skeletal muscle fibre types. These effects have typically been assessed by producing acute shortages (castration/ovariectomy) or by hormone supplementation. Little evidence exists, however, on how sex hormone shortages affect muscle development from early stages through to adulthood. Using the hypogonadal mouse model (hpg) we examined the effects of diminished androgen and oestrogen upon muscle size and fibre type composition in murine gastrocnemius and soleus muscles. Hypogonadal male soleus muscle was significantly smaller than normal males, and approximated the normal and hypogonadal females weight and fibre type characteristics. The hypogonadal male gastrocnemius muscle, however, was significantly small in comparison with normal and hypogonadal female gastrocnemius muscles, with the type IIB fibre diameters decreased most markedly. The hypogonadal female soleus muscle approximated the normal female phenotype, but the gastrocnemius muscle was larger than the normal female, approximating the size of the normal male gastrocnemius muscle. Here too, the type IIB fibres showed the most alteration, with greatly increased fibre diameters. Appropriate amounts of androgens were necessary for gender‐specific patterns of growth in male muscles, whilst similar amounts of oestrogen were necessary for female gastrocnemius muscle growth, but not for female soleus muscle. Hypogonadism in this murine model generally retards muscle development in males, but has no apparent influence or enhances muscle development in females. Type IIB fibres are most dependent upon sex hormones for appropriate development, but this relationship is muscle‐specific.
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
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.
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?
Analysis of fiber-type distribution in hypogonadal male vs. female mice reveals no significant changes in type-I, -IIA, -IIX, or -IIB fibers in gastrocnemius muscle or in type-I or -IIA fibers in the soleus.
“Analysis of fiber-type distribution in hypogonadal males vs. females reveals no significant changes in type-I, -IIA, -IIX, or -IIB fibers in gastrocnemius muscle or in type-I or -IIA fibers in the soleus (79).”
From Sex-Based Differences in Skeletal Muscle Kinetics and Fiber-Type Composition (2015) · cites this paper as [79]
In female hypogonadal mice, the hypogonadal phenotype leads to an increase in IIB fiber diameter compared with wild-type females.
“Surprisingly, in females, the hypogonadal phenotype leads to an increase in IIB fiber diameter compared with wild-type females (79).”
From Sex-Based Differences in Skeletal Muscle Kinetics and Fiber-Type Composition (2015) · cites this paper as [79]
In male hypogonadal mice, IIB fiber-type diameter significantly declines compared with wild-type males.
“However, in other instances, IIB fiber-type diameter in male hypogonadal mice significantly declines compared with wild-type males.”
From Sex-Based Differences in Skeletal Muscle Kinetics and Fiber-Type Composition (2015) · cites this paper as [79]
In hypogonadal mice, gastrocnemius fiber-type distribution is relatively unchanged from wild-type mice, with relative contribution I < IIX < IIA < IIB in both males and females.
“Additionally fiber-type distribution of the gastrocnemius is relatively unchanged from wild-type mice, with I < IIX < IIA < IIB being the relative contribution of each fiber-type in males and females (79).”
From Sex-Based Differences in Skeletal Muscle Kinetics and Fiber-Type Composition (2015) · cites this paper as [79]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
Regulation of skeletal muscle mass in mice by a new TGF-p superfamily member
McPherron, A. C., Lawler, A. M., & Lee, S.-J. (1997) · Nature · doi:10.1038/387083a0 · Cited by 4,013 · see citing works
Muscle Fiber Types: How Many and What Kind?
Brooke, M. H., & Kaiser, K. K. (1970) · Archives of Neurology · doi:10.1001/archneur.1970.00480280083010 · Cited by 2,179 · see citing works
Estrogen Receptor Null Mice: What Have We Learned and Where Will They Lead Us?
Couse, J. F., & Korach, K. S. (1999) · Endocrine Reviews · doi:10.1210/edrv.20.3.0370 · Cited by 2,045 · see citing works
Double muscling in cattle due to mutations in the myostatin gene
McPherron, A. C., & Lee, S.-J. (1997) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.94.23.12457 · Cited by 2,039 · see citing works
Growth Hormone and the Insulin-Like Growth Factor System in Myogenesis*
Florini, J. R., Ewton, D. Z., & Coolican, S. A. (1996) · Endocrine Reviews · doi:10.1210/edrv-17-5-481 · Cited by 1,092 · see citing works
Biological Actions of Androgens
MOORADIAN, A. D., MORLEY, J. E., & KORENMAN, S. G. (1987) · Endocrine Reviews · doi:10.1210/edrv-8-1-1 · Cited by 1,080 · see citing works
Katznelson, L., Finkelstein, J. S., Schoenfeld, D. A., Rosenthal, D. I., Anderson, E. J., & Klibanski, A. (1996) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem.81.12.8954042 · Cited by 791 · see citing works
Skeletal muscle enzymes and fiber composition in male and female track athletes
COSTILL, D. L., Daniels, J., Evans, W. J., Fink, W., Krahenbuhl, G. S., & Saltin, B. (1976) · Journal of Applied Physiology · doi:10.1152/jappl.1976.40.2.149 · Cited by 700 · see citing works
Testosterone administration to elderly men increases skeletal muscle strength and protein synthesis
Urban, R. J., Bodenburg, Y. H., Gilkison, C., Foxworth, J., Coggan, A. R., Wolfe, R. R., & Ferrando, A. (1995) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.1995.269.5.e820 · Cited by 608 · see citing works
Gonadotrophin-releasing hormone deficiency in a mutant mouse with hypogonadism
Cattanach, B. M., IDDON, C. A., Charlton, H. M., CHIAPPA, S. A., & Fink, G. (1977) · Nature · doi:10.1038/269338a0 · Cited by 567 · see citing works
Growth hormone and the insulin-like growth factor system in myogenesis
Florini, J. R. (1996) · Endocrine Reviews · doi:10.1210/er.17.5.481 · Cited by 536 · see citing works
Mason, A. J., Hayflick, J. S., Zoeller, R. T., Young, W. S., PHILLIPS, H. S., Nikolics, K., & Seeburg, P. H. (1986) · Science · doi:10.1126/science.3024317 · Cited by 534 · see citing works
Human variation in skeletal muscle fiber-type proportion and enzyme activities
Simoneau, J. A., & Bouchard, C. (1989) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.1989.257.4.e567 · Cited by 484 · see citing works
Gorza, L. (1990) · Journal of Histochemistry & Cytochemistry · doi:10.1177/38.2.2137154 · Cited by 280 · see citing works
HORMONAL REGULATION OF HUMAN MUSCLE PROTEIN METABOLISM
Rooyackers, O., & Nair, K. S. (1997) · Annual Review of Nutrition · doi:10.1146/annurev.nutr.17.1.457 · Cited by 225 · see citing works
Mauras, N., Rogol, A. D., Haymond, M. W., & Veldhuis, J. D. (2008) · Hormone Research · doi:10.1159/000184763 · Cited by 219 · see citing works
Muscle fibre growth in five different muscles in both sexes of mice.
Rowe, R. W. D., & Goldspink, G. (1969) · PubMed · Cited by 217 · see citing works
Martel, C., Meiner, M. H., Gagné, D., Simard, J., & Labrie, F. (1994) · Molecular and Cellular Endocrinology · doi:10.1016/0303-7207(94)90056-6 · Cited by 190 · see citing works
Androgen and estrogen binding in rat skeletal and perineal muscles
Dubé, J. Y., Lesage, R. L., & Tremblay, R. R. (1976) · Canadian Journal of Biochemistry · doi:10.1139/o76-008 · Cited by 179 · see citing works
Localization of functional domains in the androgen receptor
MacLean, H. E., Warne, G. L., & Zajac, J. D. (1997) · The Journal of Steroid Biochemistry and Molecular Biology · doi:10.1016/s0960-0760(97)00049-6 · Cited by 163 · see citing works
Metzger, D. L., & Kerrigan, J. R. (1994) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem.79.2.8045971 · Cited by 152 · see citing works
No classical type IIB fibres in dog skeletal muscle
Snow, D. H., Billeter, R., Mascarello, F., Carpenè, E., Rowlerson, A. M., & Jenny, E. (1982) · Histochemistry · doi:10.1007/bf00492533 · Cited by 140 · see citing works
Wehrenberg, W. B., & Giustina, A. (1992) · Endocrine Reviews · doi:10.1210/edrv-13-2-299 · Cited by 129 · see citing works
Cellotti, F., & Negri‐Cesi, P. (1992) · The Journal of Steroid Biochemistry and Molecular Biology · doi:10.1016/0960-0760(92)90085-w · Cited by 123 · see citing works
IBRAHIM, S. N., Moussa, S. M., & Childs, G. V. (1986) · Endocrinology · doi:10.1210/endo-119-2-629 · Cited by 118 · see citing works
Changes in muscle fibre type from adolescence to adulthood in women and men
Glenmark, B., HEDBERG, G. E., & Jansson, E. (1992) · Acta Physiologica Scandinavica · doi:10.1111/j.1748-1716.1992.tb09414.x · Cited by 104 · see citing works
Exploring the role of sex steroids through studies of receptor deficient mice
Couse, J. F., & Korach, K. S. (1998) · Journal of Molecular Medicine · doi:10.1007/s001090050244 · Cited by 91 · see citing works
Characterization of the androgen receptor in the skeletal muscle op the rat
Krieg, M. (1976) · Steroids · doi:10.1016/0039-128x(76)90114-8 · Cited by 76 · see citing works
Sauerwein, H., & Meyer, H. H. D. (1989) · Journal of Animal Science · doi:10.2527/jas1989.671206x · Cited by 75 · see citing works
Ranatunga, K. W., & Thomas, P. E. (1990) · Journal of Muscle Research and Cell Motility · doi:10.1007/bf01843577 · Cited by 72 · see citing works
Modulation of the Cytosolic Androgen Receptor in Striated Muscle by Sex Steroids*
Rance, N. E., & Max, S. R. (1984) · Endocrinology · doi:10.1210/endo-115-3-862 · Cited by 64 · see citing works
Muscle fibre growth in five different muscles in both sexes of mice. I. Normal mice.
Rowe, R. W. D., & Goldspink, G. (1969) · The Mouseion at the JAXlibrary (Jackson Laboratory) · Cited by 47 · see citing works
PHYSICAL ACTIVITY OF CHILDREN AND YOUTH
Engström, L. (1980) · Acta Paediatrica · doi:10.1111/j.1651-2227.1980.tb15329.x · Cited by 47 · see citing works
Estrogenic Inhibition of Growth Hormone-Induced Tibial Epiphyseal Growth in Hypophysectomized Rats
Josimovich, J. B., Mintz, D. H., & Finster, J. L. (1967) · Endocrinology · doi:10.1210/endo-81-6-1428 · Cited by 43 · see citing works
Sciote, J. J., & Rowlerson, A. M. (1998) · The Anatomical Record · doi:10.1002/(sici)1097-0185(199808)251:4 · Cited by 39 · see citing works
Self-citationNutritional factors affecting growth of muscle and adipose tissue in ruminants.
Byers, F. M. (1982) · PubMed · Cited by 38 · see citing works
Mechanism of estrogenic action in acromegaly
Schwartz, E., Echemendia, E., Schiffer, M., & Panariello, V. A. (1969) · Journal of Clinical Investigation · doi:10.1172/jci105982 · Cited by 37 · see citing works
Estrogens do not affect whole-body protein metabolism in the prepubertal female.
Mauras, N. (1995) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem.80.10.7559861 · Cited by 35 · see citing works
VAUGHAN, H. S., AZIZ-ULLAH, Goldspink, G., & Nowell, N. W. (1974) · Journal of Histochemistry & Cytochemistry · doi:10.1177/22.3.155 · Cited by 33 · see citing works
Familial Monotropic Pituitary Gonadotropin Insufficiency
Ewer, R. W. (1968) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem-28-6-783 · Cited by 32 · see citing works
Ono, Y., Solomon, M. B., Elsasser, T. H., Rumsey, T. S., & Moseley, W. M. (1996) · Journal of Animal Science · doi:10.2527/1996.74122929x · Cited by 32 · see citing works
Effects of intake level on metabolic response to estrogenic growth promoters in beef steers
Rumsey, T. S., & Hammond, A. C. (1990) · Journal of Animal Science · doi:10.2527/1990.68124310x · Cited by 23 · see citing works
Myosin expression in the jaw-closing muscles of the domestic cat and american opossum
Sciote, J. J., Rowlerson, A. M., & Carlson, D. S. (1995) · Archives of Oral Biology · doi:10.1016/0003-9969(94)00181-a · Cited by 23 · see citing works
Self-citationEffect of Diethylbestrol on Tissue Gain and Carcass Merit of Feedlot Beef Steers
Rumsey, T. S., Tyrrell, H. F., Dinius, D. A., Moe, P. W., & Cross, H. R. (1981) · Journal of Animal Science · doi:10.2527/jas1981.533589x · Cited by 23 · see citing works
Comparison of Effect of Oestrogen on Muscle Development of Male and Female Mice
Ihemelandu, E. C. (1981) · Cells Tissues Organs · doi:10.1159/000145442 · Cited by 21 · see citing works
Krieg, M., Smith, K. T., & Elvers, B. (1980) · Journal of Steroid Biochemistry · doi:10.1016/0022-4731(80)90023-0 · Cited by 19 · see citing works
Effect of oestrogen on muscle development of female rabbits
Ihemelandu, E. C. (1980) · Cells Tissues Organs · doi:10.1159/000145313 · Cited by 15 · see citing works
Structural and functional analysis of murine skeletal muscle after castration
Bmed, B. J., & Klueber, K. M. (1989) · Muscle & Nerve · doi:10.1002/mus.880120113 · Cited by 14 · see citing works
Androgen Receptors in Skeletal Muscle Cytosol from Sheep Treated with Trenbolone Acetate
Sinnett‐Smith, P. A., Palmer, C., & BUTTERY, P. J. (1987) · Hormone and Metabolic Research · doi:10.1055/s-2007-1011754 · Cited by 14 · see citing works
Estrogens do not affect whole-body protein metabolism in the prepubertal female
Mauras, N. (1995) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jc.80.10.2842 · Cited by 14 · see citing works
Cryer, P. E., & Daughaday, W. H. (1977) · Elsevier eBooks · doi:10.1016/b978-0-12-475360-0.50015-8 · Cited by 10 · see citing works
Flagged first, then by citations
Research works printed but not linked: 2
- Gondos, B. 1980. Development and differentiation of the testis and male reproductive tract. In: A. Steinberger & E. Steinberger (eds) Testicular Development Structure and Function, pp. 3±20. Raven Press, New York.
- Siiteri, P.K. & MacDonald, P.C. 1973. Role of extraglandular oestrogen in human endocrinology. In: R.O. Greep & E.B. Astwood (eds) Sect 7: Endocrinology, Vol. II. Female Reproductive System, Part I, pp. 615±629. American Physiological Society, Washington DC.
Cited by
Sorted by citations
Sex-Based Differences in Skeletal Muscle Kinetics and Fiber-Type Composition
Haizlip, K. M., Harrison, B. C., & Leinwand, L. A. (2015) · Physiology · doi:10.1152/physiol.00024.2014 · Cited by 521 · see citing works
The Influence of Estrogen on Skeletal Muscle: Sex Matters
Enns, D. L., & Tiidus, P. M. (2010) · Sports Medicine · doi:10.2165/11319760-000000000-00000 · Cited by 374 · see citing works
Kovacheva, E. L., Hikim, A. P. S., Shen, R., Sinha, I., & Sinha‐Hikim, I. (2009) · Endocrinology · doi:10.1210/en.2009-1177 · Cited by 197 · see citing works
Androgens modulate the inflammatory response during acute wound healing
Gilliver, S. C., Ashworth, J. J., Mills, S. J., Hardman, M. J., & Ashcroft, G. S. (2006) · Journal of Cell Science · doi:10.1242/jcs.02786 · Cited by 147 · see citing works
Estrogen replacement and skeletal muscle: mechanisms and population health
Tiidus, P. M., Lowe, D. A., & Brown, M. (2013) · Journal of Applied Physiology · doi:10.1152/japplphysiol.00629.2013 · Cited by 103 · see citing works
Sims, N. A., Brennan, K., Spaliviero, J. A., Handelsman, D. J., & Seibel, M. J. (2005) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.00311.2005 · Cited by 74 · see citing works
Pan, X., Han, Y., Zou, T., Zhu, G., Xu, K., Zheng, J.-N., Zheng, M., & Cheng, X. (2018) · Digestive Diseases · doi:10.1159/000491015 · Cited by 56 · see citing works
Muscle fiber size in healthy children and adults in relation to sex and fiber types
Esbjörnsson, M., Dahlström, M., Gierup, J., & Jansson, E. (2020) · Muscle & Nerve · doi:10.1002/mus.27151 · Cited by 55 · see citing works
Knowles, O. E., Aisbett, B., Main, L. C., Drinkwater, E. J., Orellana, L., & Lamon, S. (2019) · Sports Medicine · doi:10.1007/s40279-019-01132-7 · Cited by 48 · see citing works
Brown, D. L., Hikim, A. P. S., Kovacheva, E. L., & Sinha‐Hikim, I. (2009) · Journal of Endocrinology · doi:10.1677/joe-08-0476 · Cited by 43 · see citing works
Protective Effects of Estradiol and Dihydrotestosterone following Spinal Cord Injury
Sengelaub, D. R., Han, Q., Liu, N., Maczuga, M. A., Szalavari, V., Valencia, S. A., & Xu, X. (2017) · Journal of Neurotrauma · doi:10.1089/neu.2017.5329 · Cited by 38 · see citing works
Ezzat‐Zadeh, Z., Kim, J., Chase, P. B., & Arjmandi, B. H. (2017) · Journal of Aging Research · doi:10.1155/2017/1454103 · Cited by 37 · see citing works
Shankaran, M., Shearer, T., Stimpson, S. A., Turner, S., King, C. L., Wong, P. A., Shen, Y., Turnbull, P., Kramer, F., Clifton, L. G., et al. (2015) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.00257.2015 · Cited by 33 · see citing works
Absolute and relative growth of the rat craniofacial skeleton
Vandeberg, J. R., Buschang, P. H., & Hinton, R. J. (2004) · Archives of Oral Biology · doi:10.1016/j.archoralbio.2003.12.007 · Cited by 30 · see citing works
Collaer, M. L., Brook, C. G. D., Conway, G. S., Hindmarsh, P. C., & Hines, M. (2008) · Psychoneuroendocrinology · doi:10.1016/j.psyneuen.2008.09.007 · Cited by 28 · see citing works
Protective effects of gonadal hormones on spinal motoneurons following spinal cord injury
Sengelaub, D. R., & Xu, X. (2018) · Neural Regeneration Research · doi:10.4103/1673-5374.233434 · Cited by 25 · see citing works
Ueberschlag-Pitiot, V., Stantzou, A., Messéant, J., Lemaître, M., Owens, D. J., Noirez, P., Roy, P., Agbulut, O., METZGER, D., & Ferry, A. (2017) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.00446.2016 · Cited by 18 · see citing works
The Effects of Chronically Increased Intra-abdominal Pressure on the Rabbit Diaphragm
Papavramidis, T. S., Kotidis, E. V., Ioannidis, K., Cheva, A., Lazou, T. P., Koliakos, G., Karkavelas, G., & Papavramidis, T. S. (2012) · Obesity Surgery · doi:10.1007/s11695-012-0587-2 · Cited by 13 · see citing works
Zhang, Z., Zhao, L., Johnson, S., Rhoads, M. L., Jiang, H., & Rhoads, R. P. (2018) · Domestic Animal Endocrinology · doi:10.1016/j.domaniend.2018.07.003 · Cited by 13 · see citing works
Diaphragmatic Adaptation Following Intra-abdominal Weight Charging
Papavramidis, T. S., Kotidis, E. V., Ioannidis, K., Cheva, A., Lazou, T. P., Koliakos, G., Karkavelas, G., & Papavramidis, T. S. (2010) · Obesity Surgery · doi:10.1007/s11695-010-0334-5 · Cited by 13 · see citing works
Atwood, C., & Bowen, R. L. (2006) · Medical Hypotheses · doi:10.1016/j.mehy.2006.08.037 · Cited by 12 · see citing works
Combined Effects of Exercise and Phytoanabolic Extracts in Castrated Male and Female Mice
Martins, J. P., Silva, L. C., Nunes, M. S., Rübensam, G., de Oliveira, J. R., Silva, R. B. M., & Campos, M. M. (2021) · Nutrients · doi:10.3390/nu13041177 · Cited by 4 · see citing works
Rashidi, E., Tehrani, F. R., Valizadeh, M., Niroomand, M., Mahdavi, M., Farahmand, M., Abiri, B., Azizi, F., & Hosseinpanah, F. (2024) · BMC Women s Health · doi:10.1186/s12905-024-03501-5 · Cited by 3 · see citing works
Transgenic growth hormone mice exposed to lifetime constant illumination: gender-specific effects
Perreault, M. L., & Rollo, C. D. (2004) · Canadian Journal of Zoology · doi:10.1139/z04-071 · Cited by 2 · see citing works
Bookless, C. (2026) · University of Southern Queensland ePrints (University of Southern Queensland) · doi:10.26192/9y814
The Effect of Estrogen Deprivation on the Cellular Stress Response following Muscle Damage
Salerno, S. A. (2017) · TSpace (University of Toronto)
Bamba, B., Silué, S., Atayi, T. E., & Tako, A. N. (2023) · Journal of Biosciences and Medicines · doi:10.4236/jbm.2023.115006
- Authors
- Sciote, J. J., Horton, M. J., Zyman, Y., & Pascoe, G.
- Affiliations
- University of Pittsburgh (US)
- Corresponding author
- Sciote, J. J.
- Venue
- Acta Physiologica Scandinavica
- Publisher
- Wiley
- Published
- 2001-07-24
- Volume
- 172
- Issue
- 3
- Pages
- 179-187
- ISSN
- 0001-6772 (ISSN-L)
- 1365-201X
- OpenAlex
- W2069975915
- Cited by
- 27
- References
- 49
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 4 · 2015: 2 · 2013: 1 · 2012: 1
- FWCI
- 0.23
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Acta Physiologica Scandinavica (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
- Keywords
- hypogonadism, estrogen, androgens, skeletal muscle development, muscle fiber type distribution, type IIb muscle fibers, muscle fiber diameter, sex differences, gastrocnemius, soleus muscle, muscle growth
- MeSH terms
- Adenosine Triphosphatases, Aging, Androgens, Animals, Estrogens, Female, Hypogonadism, Immunohistochemistry, Male, Muscle, Skeletal, Muscle Fibers, Skeletal, Muscle Development, Mice
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