AIF1 and Alzheimer disease: To determine the distribution of Gal‐9 in the AD brain, we co‐stained Gal‐9 with the microglial marker IBA1, and found that Gal‐9 predominantly colocalized with microglia and was especially confined to Aβ plaque‐associated microglia in AD patients and APP/PS1 mice (Figure 1g).