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. 2015 Aug 5;9:301. doi: 10.3389/fncel.2015.00301

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Copyright © 2015 Smolders, Smolders, Swinnen, Gärtner, Rigo, Legendre and Brône.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Embryonic microglia show no increased expression of IL1β after single and double injection of poly (I:C). (A–F1) Coronal sections of embryonic brains, with cell nucleus staining in blue (DAPI) and microglial (CX3CR1-eGFP) cells in green. Immunohistochemical staining using an IL1β antibody (red) showed that at E17.5 almost no microglial cells in the cortex were immunoreactive for IL1β (A2) after injection with saline. At E11.5 (B2) and E17.5 (C2,E2) in the cortex and E17.5 hippocampal area (D2,F2) there was no increased percentage of microglial cells expressing the activation marker after poly (I:C) challenge compared to control. White square indicates the location of the cells in the tissue showed in the inset; ^∗ indicates an IL1β positive eGFP cell. Examples of one control brain area and poly (I:C) group only as they were not significantly different. Scale bar = 100 μm and for insets = 20 μm.