머리카락, 손톱, 피부 등을 구성하는 섬유성 단백질
A fibrous structural protein that is the key material making up hair, nails, feathers, horns, and the outer layer of skin.
예문:
"Keratin is the primary protein found in human hair and nails, providing them with strength and structure."
"The outer layer of the skin contains dead cells filled with keratin to protect the body from environmental damage."
"Birds' feathers are composed of a specific type of keratin that allows for both flexibility and durability during flight."