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Validation of microarray results. Data are presented as fold change over control values (n = 5 mice/group, ± SEM): 1, 6 wk smoke; 2, 6 wk smoke + 6 wk break; 3, 12 wk smoke; and 4, 12 wk smoke + 6 wk break. Asterisk indicates significant at p < .05, t-test conducted on RT-PCR values.
