A monoclonal antibody specific to apolipoprotein E 4 (apoE4) was applied immunohistochemically to archival human brain tissue. The examined 30 cases comprised four epsilon/epsilon4, 10 epsilon3/epsilon4, one epsilon2/epsilon4, 10 epsilon3/epsilon3 and five epsilon2/epsilon3 genotypes. The anti apoE4 antibody visualized senile plaques, neurofibrillary tangles and reactive astrocytes, as well as serum in the blood vessels and vascular smooth muscle cells in the cases of epsilon4.
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