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F4/80 staining showed macrophage accumulation in ApoE knockout mouse aorta. (a, b) ApoE knockout mouse aorta slice before and after F4/80 staining. (c, d) Wild-type mouse aorta slice before and after F4/80 staining. Prussian blue staining of (e) ApoE knockout mouse and (f) wild type aorta after incubation with HA-NWs. The staining (blue green color) was much more intense in panel e than f.
