(A-C) Representative immunofluorescence images visualizing (A) cortical mMΦ, (B) cpMΦ located in the lateral ventricle and (C) hippocampal pvMΦ from SPF (left), GF (middle) and ABX-treated 5xFAD mice (right). Iba1 (green) and Aβ (6E10, red). Nuclei were stained with DAPI (blue). White arrowheads indicate Iba1+Aβ+ MΦ and white arrows show Iba1+Aβ- MΦ. Scale bar: 50 μm. 