several cultures established from biopsies of apparently normal adult human glial material showed no cells positive for glial fibrillary acidic protein ( gfa ) when examined after seven or more cumulative population doublings ( cpd ) , although the established glioma line u251 mg showed approximately 3 % gfa-positive cells , and u333 cg/343 mg clone 3 showed greater than 98 % gfa-positive cells .
C0027836
glial
C0017638
glioma