Cytokeratin

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Cytokeratins are a family of cysteine-rich fibrous structural proteins that form tough filaments or sheets. These proteins are the main component of intermediate filaments in the epidermis, hair, nails, horny tissues, and the organic matrix of tooth enamel.

**Synonyms:** - Keratin