| Most leukoplakias are caused by hyperkeratosis or a thickening of the outer keratin layer. |
| Mammalian hair, made of a protein called keratin, serves at least four functions. |
| Although baleen is commonly called whalebone, it is not bone but keratin, the same material as your nails and hair. |
| Perhaps the most primitive structure unit was cablelike and reflected the filamented keratin macromolecule. |
| Excess keratin should be pared away with a scalpel blade to expose the floor of the ulcer and allow efficient drainage of the lesion. |
| Your fingernails are composed of layers of keratin, a protein also found in hair and skin. |
