TREM2 and Alzheimer disease: Next, since it is necessary to examine how many ePtdSer+‐Aβs exist and their relevance for TREM2+ microglia in the brain of the AD mouse model, brain cortex tissues from APPNL‐G‐F/MAPT dKI mice were cryosectioned and visualized (Figure4; Figure S7, Supporting Information).