Fig. 3From: Comparison of proteins with anti-influenza virus effects in parotid and submandibular-sublingual saliva in humansProtein-bound sialic acid concentration of SMSL and parotid saliva samples collected from the orifice of the respective glands in 12 subjects. Protein-bound sialic acid concentration = total sialic acid concentration - free sialic acid concentration. Values are shown in box and whisker plots with the median, interquartile, and range. Cross mark and circle represent the means and outliers, respectively. Wilcoxon signed-rank test; **p < 0.01Back to article page