Egfr, Ccnd1, c-fos and transgenic c-fos (c-fostg) mRNA expression levels in tumors of H2-c-fosLTR/Egfrwt and H2-c-fosLTR/Egfr∆Ob mice normalized to Tbp. n=17 wt, 14 ∆Ob (Egfr, Ccnd1), n=16 wt, 13 ∆Ob (c-fos), n=16 wt, 14 ∆Ob (c-fostg 