(a)
(b)
(c)
Figure 3: Double immunofluorescence staining of ALDH1A1 and CD44v6 in chronic nasopharyngitis and NPC tissues. The expression of CD44v6 (green) and ALDH1A1 (red) was assessed by immunofluorescence staining. Nuclei were counterstained by DAPI (blue). Original magnification is 100x (a, b) and 200x (c). Scale bar represents 50 μm.