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Pre-existing impairment of meningeal lymphatic drainage exacerbates sepsis-induced neuroinflammation in aged mice. A Immunofluorescent staining was used to detect Iba1 (red) in the hippocampus. B Quantitative results of the percentage of Iba1-positive areas in the total area of the image. n = 6. C, D Levels of Il-1β and IL-6 in the hippocampus, n = 6. **P < 0.01. All data are expressed as the mean ± SD
