Glossary & References / Keywords List / Definitions:

Term to be defined Definition Synonyms & Keywords
Keratin - "a complex, insoluble protein that is the principal component of the epidermis, hair, nails and feathers."(B92 - mycological [fungal]  and histopathological terms)

- "Class of tough, fibrous proteins that are components of hair, skin, claws, and horn."(B79 - Animalia (Animals) associated terms)