Protein Found in Nails, Hair, and Hoofs

This page is the CodyCross answer for the clue below from La Bella Roma, Group 415, Puzzle 4 (Bocca Della Verita).

Question is: Protein Found in Nails, Hair, and Hoofs

and the answer is: KERATIN

Word Meaning:

KERATIN — (biochemistry) The protein of which hair and nails are composed.

Definitions from Wiktionary.