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Lux expression after injection of IE-lux DNA. Mice were injected with 100 μg of IE-lux i.m. into both quadriceps or i.d. at the base of the tail. The entire muscle or injected skin area was removed 5 days later to determine the lux activity. Results shown are the mean ± SEM relative light units from eight injected muscles and four skin samples. Background activity in uninjected tissues was 306 ± 28 for muscle and 377 ± 71 for skin.
