2 week induced CK-p25 mice and age-matched controls were perfused with 50 mls PBS to wash away blood and minimize macrophage contamination in the brains. Hippocampal tissue was harvested immediately after perfusion and a single-cell suspension was prepared as described previously56 (link). Fluorescence-activated cell sorting (FACS) was then used to purify CD11b+ CD45low microglia cells using APC conjugated CD11b mouse clone M1/70.15.11.5 (Miltenyi Biotec, #130-098-088) and PE conjugated CD45 antibody (BD Pharmingen, #553081). Cells were collected directly into RNA lysis buffer (Qiagen, #74104).