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  1. Beta-keratin - Wikipedia

  2. Keratin: Protein, Structure, Benefits, Uses. Hair Keratin ...

  3. Keratin: Protein, Structure, Benefits, Uses & Risks

  4. What is beta carotene? What are the benefits?

  5. Keratin | Definition, Function, & Facts | Britannica

  6. Keratin: Structure, mechanical properties, occurrence in ...

  7. Structure and functions of keratin proteins in simple ...