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Luc activity and bicistronic mRNA expression in tissues of mice of different ages. For the evaluation of bicistronic mRNA levels, comparative RT-PCR amplifications were hybridized by Southern blotting and quantified with a PhosphorImager. The quantity of bicistronic mRNA was normalized to the amount of β-actin RNA. (A) Heart, Lucy mice; (B) brain, Lucy mice; (C) kidneys, Therese mice; (D) brain, Therese mice. Scales are in arbitrary units.
