A) Representative cytometry plots of CD11b+ populations present in the cortex of CX3CR1GFP/+ or CX3CR1GFP/+;Sfrp1-/- mice 3 days after saline or LPS intraventricular infusion. Gating was set for isolating the following myeloid cell populations: CD11b+;CD45lo;GFP+ surveying microglia, CD11b+;CD45+;GFP+ activated microglia and CD11b+;CD45+;GFP- infiltrated monocytes. 