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the claim

Keratin is a fibrous protein that constitutes hair, fingernails, bird feathers, and cytoskeleton filaments.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Keratin is a fibrous protein that constitutes hair, fingernails, bird feathers, and cytoskeleton filaments?

Yes. Multiple reliable reference sources explicitly confirm that keratin is a fibrous protein constituting hair, fingernails, feathers, and cytoskeleton filaments.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 4
Agency for Toxic Substances and Disease Registry (US): TOXICOKINETICS, SUSCEPTIBLE POPULATIONS, BIOMARKERS, CHEMICAL INTERACTIONS - Toxicological Profile for Mercury
Notes hair and nails are composed largely of keratin.
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Agency for Toxic Substances and Disease Registry (US): TOXICOKINETICS, SUSCEPTIBLE POPULATIONS, BIOMARKERS, CHEMICAL INTERACTIONS - Toxicological Profile for Mercury. (n.d.). Agency for Toxic Substances and Disease Registry (US). https://www.ncbi.nlm.nih.gov/books/NBK611017/#ch3

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More for · 3
LibreTexts: LibreTexts: 3.02: Levels (Orders) of Protein Structure
States keratin is a fibrous protein making up hair, fingernails, feathers, and cytoskeleton filaments.
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LibreTexts: LibreTexts: 3.02%3A Levels (Orders) of Protein Structure. (n.d.). LibreTexts. https://bio.libretexts.org/Bookshelves/Cell_and_Molecular_Biology/Basic_Cell_and_Molecular_Biology_(Bergtrom)/03%3A_Details_of_Protein_Structure/3.02%3A_Levels_(Orders)_of_Protein_Structure

OpenStax: OpenStax Microbiology: 21.4 Mycoses of the Skin
States keratin is a protein found in skin, hair, and nails.
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OpenStax: OpenStax Microbiology: 21.4 Mycoses of the Skin. (n.d.). OpenStax. https://openstax.org/books/microbiology/pages/40b12d45-3308-4a1b-b8e8-d60b780af8b3@

Semantic Scholar peS2o: Microsatellite-Primed PCR for Intra-species Genetic Relatedness in Trichophyton ajelloi Strains Isolated in Poland from Various Soil Samples
Mentions keratin structures such as hair, fingernails, and feathers.
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Semantic Scholar peS2o: Microsatellite-Primed PCR for Intra-species Genetic Relatedness in Trichophyton ajelloi Strains Isolated in Poland from Various Soil Samples. (n.d.). Semantic Scholar peS2o. https://www.jstage.jst.go.jp/article/jsme2/29/2/29_ME13160/_pdf

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