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Luciferase expression (RLU/mg protein) in the trachea and lung of BALB/c mice following administration of naked pCIKLux, dextran-spermine only (D-SPM), and various weight-mixing ratios of D-SPM/pCIKlux complexes ranging 14 to 18 at 2 days posttreatment. The amount of DNA was kept to 10 μg. Untreated mice was served as the control. Data are presented as mean ± S.E.M from 6 animals.
