Effects of COX-2 deficiency on LPS-induced neuronal degeneration. Representative photomicrographs of FluoroJade-B staining in the hippocampus of COX-2+/+ and COX-2-/- mice 24 h after icv injection of LPS or vehicle. High magnification (10×) images of FluoroJade-B staining in the hippocampus are shown. The inset shows details of the neurons stained by FluoroJade-B in the hippocampus of COX-2-/- mice 24 h after icv injection of LPS (40× magnification). Bars represent 100 μm.