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Levels of COX-1 expression measured by RT-competitive PCR. Data are shown as box plots: the box covers all values (including minimum and maximum values), and the central continuous line in each box represents the mean. Levels of COX-1 expression in each case were normalised to that of β-actin mRNA (10−3 ng of mimic DNA). There was no difference in COX-1 mRNA expression levels between groups. AOM, azoxymethane.
