Immunogen sequence: TYRRLLEGED AHLSSSQFSS GSQSSRDVTS SSRQIRTKVM DVHDGKVVST HEQVLRTKN. Cytokeratins (CK) are intermediate filaments of epithelial cells, both in keratinizing tissue (ie. skin) and non-keratinizing cells (ie. mesothelial cells). At least 20