Fig. 4.

Differential gene activity between chemically-induced skin tumors of D4BE and D4OE mice. Expressions of selected genes in tumor tissue samples were examined using quantitative RT-PCR. Tests were done in triplicate. All RT-PCR data were normalized to β-actin levels. For each gene, relative mRNA levels of D4OE tumor samples were compared to the reference D4BE levels and presented as x-fold change. Error bars represent SEM