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Typical longitudinal luciferase expression kinetics in intact ex vivo human skin on DNA tattooing. Lines represent expression in three different tattooed areas of 50 mm2, on three different skin explants. The skin was tattooed with pVAX:Luc at 5 mg/ml for 20 sec, using the Aella tattoo machine at a depth of 1.5 mm. Note that the kinetics of luciferase expression are comparable in skin samples derived from different donors.
