Mice were euthanized 12 weeks after inhalation and lungs were harvested for tumor analysis. All experimental mice were similar in body weight before and after infection with Ad-Cre at the age of 4 weeks (11.1 ?0.5 g) and 16 weeks (32.7 ?1.1 g).Histological analysis of lung tumorsMethodsMiceAll mice included in this study had a C57Bl/6 genetic background. Male heterozygous mice containing a floxedL