Figure 4From: Evaluation of the in vitro skin permeation of antiviral drugs from penciclovir 1% cream and acyclovir 5% cream used to treat herpes simplex virus infection Keratin 5 in tape strips from excised human skin treated with penciclovir 1% cream was detected by Western blot analysis. For the Strip 1 in lane 1, the Strip 2 in lane 2 and the last Strip in lane 5 the signal of the 60 kD band was faint when compared to the pooled strips in lane 3 and 4.Back to article page