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Silver-stained lesions in the left prefrontal neocortex of the aged chimpanzee. A: Campbell-Gallyas-stained neuritic plaque (tortuous black neurites, arrow). This plaque was positive with the anti-tau antibody CP-13 in an adjacent section (not shown). B: Two cortical cells stained with the Bielschowsky silver method. Bar = 50 μm for both A and B.
