in an extensive immunocytochemistry study for glial fibrillary acidic protein ( gfap ) of human neuropathological biopsy or autopsy tissue specimens examined for diagnostic or research purposes , rare non-glial specificities of the gfap immunostain were observed : schwann cells of some small nerves in salivary gland , renal capsule , and in epidural fat adjacent to a metastatic carcinoma , schwann and satellite cells in a spinal ganglion invaded by tumor , chondrocytes of epiglottic cartilage , few cells of a malignant pleomorphic adenoma of salivary gland , most cells of a recurrent papillary meningioma with areas similar to the hemangiopericytic variant , and many cells of a renal carcinoma metastatic to brain ;
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