Alpha-keratin is a protein present in

1. Keratins are a group of fibrous structural proteins found in vertebrates. 2. Alpha-keratin (α-keratin) is a specific type of keratin protein. 3. It is the key structural material making up hair, wool, feathers, horns, claws, hooves, and the outer layer of skin. 4. Among the given options, wool (sheep's hair) is primarily composed of alpha-keratin. 5. Skin also contains keratin, particularly in the epidermis. Blood proteins include albumin, globulins, fibrinogen, and hemoglobin. Eggs are rich in proteins like albumin (in the white) and vitellin (in the yolk).