Turnover of monocytes is accelerated in Cebpb^−/− mice. Time-course analysis of the incorporation of BrdU into Ly6C⁺ and Ly6C⁻ monocytes in the BM and PB after BrdU pulsing (n = 3-8 mice per group). The percentages of BrdU⁺ cells among the indicated monocyte subsets are shown. *P < .05, **P < .01.