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mRNA Expression of marker genes (A) AhR, (B) AhRR, (C) COX-2, and (D) C/EBPβ in mammary tissue during tumor development from 4 to 12 weeks in PyMT mice (n = 15) compared to wt mice (n = 15). NS, not significant; plot of single data points of 15 mice in each group are shown and two-tailed Student's t-test was used to test for statistical significance. Significantly different **p < 0.01, ***p < 0.001, ****p < 0.0001.
