Figure 5.

Newly divided inflammatory cells (BrdU+) on day 1 or 3 in circulating blood from nonsensitized guinea pigs after a 4-hour exposure to 2 ppm ozone or filtered air. BrdU+ newly divided cells are shown as hatched bars or hatched portions of bars; BrdU– preformed cells are shown as not hatched (white or solid color). Data from animals exposed to filtered air are shown in white bars; data from animals exposed to ozone are in grey bars. Data are expressed in millions of cells/mL blood, mean ± SEM. Filtered air day 1 (n = 8), ozone day 1 (n = 7), filtered air day 3 (n = 9), and ozone day 3 (n = 8). * = P < 0.05 by one-way ANOVA with a Bonferroni correction.