Keratin is a fibrous protein. It's a structural protein that forms the building blocks of hair, nails, and the outermost layer of skin (the epidermis). Keratin also plays a role in wound healing.
Keratin is classified as a scleroprotein, a type of fibrous protein known for its strength and rigidity. It's made up of long chains of amino acids that are tightly wound together, forming a strong and resilient structure.
The type of keratin found in vertebrates is called alpha-keratin (α-keratin).
Keratin is also known for containing disulfide bonds which contribute to its strength and resistance to damage.
