Representative fluorescent images of all cell types of primary mixed Schwann cell/fibroblast cultures. Cell type specific stainings are shown in red and MNPs in green (arrows). Schwann cells in (A) and (B) are stained with anti-S100 antibody and fibroblasts in (C) and (D) with anti-fibronectin antibody. Images (A) and (C) illustrate control cells without MNPs and images (B) and (D) cells after MNP incubation. Bars represent 50 μm.