Luciferase expression in the liver of different rat strains after iv injection of 1010 iu Ad5 Adapt Luc. The luciferase expression was determined two days (gray bars) and seven days (black bars) after virus injection. Determination after 2 or 7 days reveals a 10-fold difference (p = 0.0001, Scheffé post-hoc test.) in luciferase activity between the Wag/Rij and the Brown Norway. Six animals per group, data are expressed as mean ± SD.