six chordomas , nine chondrosarcomas , and three myxopapillary ependymomas of the filum terminale were evaluated immunohistochemically for the expression of intermediate filament proteins by the use of monospecific antibodies against intermediate filament proteins of keratin , vimentin , and glial fibrillary acidic protein ( gfap ) type .
C0021769
intermediate filament proteins
C0042666
vimentin