Double labeling of slices for GS lectin and Aβ. Microglia are blue, and Aβ (10G4) isbrown. A, Control slice revealing no Aβir. B, Aβ plus TGF-β1-treated slice demonstrating double labeling of microglia for Aβ and GS lectin (arrows). C, Aβ plus TGF-β2-treated slice demonstrating intense labeling of neuronal structures with large invading microglia (arrow). Scale bar, 20 μm.