Which fibrous protein is the major constituent of hair, nails, feathers, beaks and claws?

Which fibrous protein is the major constituent of hair, nails, feathers, beaks and claws?
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Keratin
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If we had claws/wings/tails/horns/etc we would have to go to a claw/wing/tail/horn/etc salon when we had a fancy party or wanted to look nice. How would fashion trends, daily life inconveniences, clothes design change if we had other animal body parts?

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