quantitative analysis of total gangliosides and of ganglioside composition by hptlc has been carried out on the gray matter of frontal cerebral cortex of six brains from down 's syndrome ( ds ) adults , six age-matched controls , six alzheimer 's disease ( ad ) adults , and six controls matched for age with the ad brains , as well as on three ds and six control cerebellum specimens .
C1707348
gray matter
C0006104
brains