Figure 6. Histological staining of brain of old untrained ApoE^−/− and C7 mice .

Negative control (A), positive F4/80 (B) and positive IgG (C) for an old ApoE^−/− untrained mouse (left side, at the level of the fornix fimbriae, original magification ×20). Negative control (D), positive F4/80 (E) and positive IgG (F) for an old C57 untrained mouse (left side, at the level of the fornix fimbriae, original magification ×20).