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the claim

Keratins are found in hair, quills, feathers, horns, and beaks.

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

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

AS REPORTEDno primary record reached; this is what the reporting says

Is it true that Keratins are found in hair, quills, feathers, horns, and beaks?

Yes. Reliable reference texts and biochemical sources explicitly confirm that keratins are the primary structural proteins found in hair, quills, feathers, horns, and beaks.

Verdict: SUPPORTED · 3 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 · 3
Wikipedia: Keratin
Reference article covering this claim directly
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Wikipedia: Keratin. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Keratin

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More for · 2
Wikibooks: Wikibooks: Structural Biochemistry/Enzyme Catalytic Mechanism/Protein Function
Explicitly states that keratins are found in hair, quills, feathers, horns, and beaks.
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Wikibooks: Wikibooks: Structural Biochemistry/Enzyme Catalytic Mechanism/Protein Function. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/Structural_Biochemistry/Enzyme_Catalytic_Mechanism/Protein_Function

Wikibooks: Wikibooks: Structural Biochemistry/Volume 6
Identical to item [3], explicitly stating keratins are found in hair, quills, feathers, horns, and beaks.
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Wikibooks: Wikibooks: Structural Biochemistry/Volume 6. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/Structural_Biochemistry/Volume_6

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