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Figure 2 The circulating polymorphonuclear leukocyte (PMN) band cell counts (A) and accumulative number of 5"-bromo-2"-deoxyuridine (BrdU)-labeled PMNs from the bone marrow mitotic pool (weakly stained cells, G1 cells) in the circulation (B). (A) The circulating PMN band cell counts increased during the second and third weeks of exposure (day 15: p < 0.01; day 18: p < 0.05). Rabbits were exposed to particulate matter <10 µm (PM₁₀) for four weeks (solid circles; n = 10) or saline (control; open circles; n = 6). Data are presented as the mean value ± SE. *p < 0.01 and p < 0.05, compared with control group. (B) Exposure to PM₁₀ increased the size of the marrow mitotic pool. Rabbits were exposed to PM₁₀ for four weeks (solid circles; n = 10) or saline (control; open circles; n = 6). Data are presented as the mean value ± SE. *p < 0.05, compared with control group.