Figure 1: Double immunofluorescence staining of 8-nitroguanine and CD44v6 in chronic nasopharyngitis and NPC tissues. Formalin-fixed and paraffin-embedded biopsies of nasopharyngeal tissues were obtained from chronic nasopharyngitis (inflammation) and NPC tissues. The expression of 8-nitroguanine (red) and CD44v6 (green) were assessed by immunofluorescence staining. Nuclei were counterstained by DAPI (blue). Original magnification is 100x. The enlarged picture is shown in the inset. Scale bar represents 50 μm.