Fig. 3. Principal coordinate analysis (PCoA) plot analysis based on weighted UniFrac distances at the operational taxonomic unit (OTU) level, at 97% identity. Each sample is represented by a dot. Balls represent samples from male subjects, whereas triangles denote samples from female subjects. The samples did not form well-separated clusters between these two groups, suggesting a similar structure in salivary microbial communities between male and female subjects. PC: principal component.
