Hep2 cells transfected with Si-cypA or Si-Ctrol for 24 h were infected with RSV-GFP (multiplicity of infection [MOI] = 1) for another 24 h; we noticed that there was more expression of green fluorescent protein (Fig. 2D and E) in the Si-cypA group than in the Si-Ctrol group. Here, PPIA is linked to infection.