{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"HBME-1 (Hector Battifora Mesothelial-1) is expressed on mesothelial cells, specialized cells that line the surfaces of the body cavities, including the pleural, pericardial, and peritoneal cavities. These cells play a crucial role in providing a smooth, lubricated surface that allows organs to move within their respective cavities."}]}]}