Expression of selected phenotype markers in cultured microglia. Microglia were stained with markers as indicated after exposure for 12 or 36 h to LPS or IL-4, with PBS as control. All photomicrograph were taken at 63× magnification, scale bar 25 μm. Panels A–F, Cox-2 in red, IL-1RA in green and Hoechst in blue. Panels G–L, Arg1 in red, iNOS in green and DAPI in blue.