Extended Data Fig. 1: Lipid droplet accumulating microglia are abundant in the hippocampus but rare in other brain regions of aged mice.

a–d, Representative confocal images of the cortex (a), thalamus (b), corpus callosum (c) and hippocampal dentate gyrus (d) from 20-month old male mice stained for BODIPY+ (lipid droplets) and Iba1+ (microglia). Scale bar: 20 μm. Arrows point towards BODIPY+ lipid droplets. e, Quantification of BODIPY+/Iba1+ cells. n = 4 mice per group. One-way ANOVA followed by Tukey’s post hoc test. Error bars represent mean ± SD. ***P< 0.001.