Keratin can be categorized as a noun.
Noun |
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| keratin - a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves |
| # | Sentence | ||
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| 1. | noun | Keratin is one of a family of fibrous structural proteins known as scleroproteins. | |
| 2. | noun | Keratin is a fibrous protein produced by chordates. It may be found in hair, skin, claws, and wool. | |
| 3. | noun | Cats' tongues are covered in little hooks made of keratin. |
| Sentence | |
|---|---|
| noun | |
| Keratin is one of a family of fibrous structural proteins known as scleroproteins. | |
| Keratin is a fibrous protein produced by chordates. It may be found in hair, skin, claws, and wool. | |
| Cats' tongues are covered in little hooks made of keratin. | |