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The process by which cells are hardened to make skin, nails, and hair.

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The process by which cells are hardened to make skin, nails, and hair.

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No, keratin is protein No, keratin is protein

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Medication for your heart pain. Or if you get heart burn or something.

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Medication for your heart pain. Or if you get heart burn or something.

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Medication for your heart pain. Or if you get heart burn or something.

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