Answer the following question given this paragraph: 

Along with the skin, the integumentary system includes the nails and hair. Both the nails and hair contain the tough protein, keratin. The keratin forms fibers, which makes your nails and hair tough and strong. Keratin is similar in toughness to chitin, the carbohydrate found in the exoskeleton of arthropods.


Q: What is the name of the protein that is found in hairs and nails?


A:
keratin