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Cytokines expressed in the choroid plexus 4 h after systemic endotoxin injection. Immunohistofluorescence staining revealed that CCL2 (A), CXCL1 (B) and CXCL2 (C) were expressed by both epithelial cells and stromal cells of the choroid plexus 4 h after LPS injection. The majority of epithelial cells were immunopositive for these cytokines. Stromal cells were occasionally immunopositive (arrow heads). Nuclei were counterstained with DAPI. Bars =20 μm.
