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keratin


Term: keratin
Literally meaning: “protein of  horn”
Origin: Anc Greek
κέρας/keras(=horn) > (genitive): κέρατος/keratos
Coined/History 
The word appeared in literature around 1849 but the first attempt to extract keratins was by John Hoffmeier  in 1905.
Definition
Keratins is a group of insoluble and tough fibrous proteins that are the main structural component in skin, nails, hair, horns, feathers, hooves and teeth. Keratins are rich in sulfur-containing aminoacids such as cysteine.  

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