Fig. 1

Confirmation of PK-15 cells expressing NS4A. a Confirmation of PK-15 cells expressing NS4A by fluorescence detection of the GFP reporter. Mock represents PK-15 cells; NC represents PK-15 cells expressing the empty vector; NS4A represents PK-15 cells expressing NS4A. b Western blotting for NS4A expression in PK-15 cells expressing NS4A. β-Actin was used as an internal control. The blots were cropped from the original blot by using Adobe Photoshop CS6, and the full-length original blots and multiple exposure images are included in additional files 3, 4 and 5