the.com/keratin
The protein that builds your armor, then files it down to nothing.
means A tough, fibrous structural protein that forms hair, nails, skin, hooves, horns, and feathers.
from From Greek keras, horn — the original keratin showpiece, jutting confidently off a beast's skull.
Same stuffYour fingernails and a rhino horn share it.
Two flavorsSoft keratin makes skin, hard makes nails.
Sulfur bondsDisulfide links give hair its stubborn strength.