Cytokeratin 19 fragment (CYFRA 21-1; Keratin 19) is a type 1 keratin and a member of the keratin family of intermediate filament proteins expressed by epithelial cells. CYFRA 21-1 is a potential prognostic biomarker of epithelial damage for idiopathic pulmonary fibrosis (IPF).
Swiss-Prot Accession Number: P08727
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