Reduced numbers of Gr1^low monocytes in CX₃CR1-deficient mice under atherosclerotic condition and rescue by Bcl2 expression. Blood monocyte levels of irradiated apoe^−/− recipients of wt (□) and cx₃cr1^gfp/gfp (■) BM cells, either transgenic (hBcl2 tg) or nontransgenic (non-tg) for hMRP8bcl2. (A) Summary of total monocytes, identify as CD115⁺ cells (R2 gated cells, Figure 1A), as a percentage of ngWBC (R1 gated cells, Figure 1A); n = 12. (B) Summary of Gr1^low monocytes levels (R4 gated cells, Figure 1A) as a percentage of total CD115⁺ monocyte levels (R2 gated cells, Figure 1A); n = 12. *P < .01, **P < .05 (Student t test).