(A) Mononuclear cells from blood of apoE^+/+ and apoE^–/– mice consuming either chow or Western diet were stained with anti-CD11b, -CD90, -B220, -CD49b, -NK1.1, –Ly-6G, and –Ly-6C mAbs. Living cells were gated to determine presence and percentage of CD11b^hiCD90^loB220^loCD49b^loNK1.1^loLy-6G^lo monocytes (top row) and further divided into Ly-6C^hi and Ly-6C^lo subsets (bottom row). Representative dot plots and histograms from individual mice are depicted. Percentages of cells are shown as mean ± SEM. (B) Total blood monocytes in apoE^+/+ and apoE^–/– mice consuming either Western diet (+) or chow (–). (C) Total blood Ly-6C^hi monocytes. (D) Total blood Ly-6C^lo monocytes. (E) Total peripheral blood leukocytes. (F) Representative dot plots depicting expression of CD62L and CD11c among Ly-6C^hi and Ly-6C^lo monocytes. Percentages of cells in each quadrant are shown as mean ± SEM. (G) Representative cytospin preparations of purified blood Ly-6C^hi and Ly-6C^lo monocytes in apoE^+/+ mice on chow and apoE^–/– mice on Western diet. Scale bar: 10 μm. Student’s t test was used. Results are representative of 8 independent experiments with 5–14 mice per group.