we found that ( 1 ) glial fibrillary acidic protein , s-100 protein , and leu 7 epitopes were detected only in well-differentiated glial cells that were interpreted as reactive and not neoplastic , ( 2 ) undifferentiated neoplastic cells expressed both neuron-specific enolase and retinal s-antigen immunoreactivity , and ( 3 ) differentiated cells forming flexner-wintersteiner rosettes were found to express neuron-specific enolase , retinal s-antigen , and , occasionally , neurofilament protein .
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