a case of esthesioneuroblastoma , the pathological diagnosis of which almost always causes great difficulties , was investigated ultrastructurally , biochemically , and immunohistologically , using antibodies against the five known types of intermediate filaments [ keratin , vimentin , desmin , glial fibrillary acidic protein ( gfap ) and neurofilaments ] .
C0021770
intermediate filaments
C0017626
glial fibrillary