thus cells can be grouped into six different classes , i.e . epithelial cells characterized by cytokeratins , most but not all neurones characterized by neurofilaments ( nfs ) , glial cells characterized by the presence of glial fibrillary acidic filaments , muscle cells characterized by the presence of desmin filaments , mesenchymal cells and certain other nonepithelial cell types characterized by the presence of vimentin , and other cells that appear not to contain ifs .
C0042666
vimentin
C0021770
ifs