{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Cytokeratin 18 is a type I cytokeratin and is typically partnered with Cytokeratin 8. They are expressed in simple and glandular and transitional epithelial cells but not in stratified epithelial cells."}]},{"type":"paragraph","children":[{"type":"text","value":"Cytokeratin 18 antibody stains positively in Adenocarcinomas originating from simple and glandular epithelium, and also in poorly differentiated tumor cells of Squamous Carcinoma."}]}]}