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Bacterial composition on phylum (A) and genus (B) levels by OTU analysis. S, saliva group; W, oral wash group; T, tumor tissue group. The leading phyla were Firmicutes, Bacteroidetes, Proteobacteria, Fusobacteria, and Actinobacteria. On the genus level, the predominant genera were Prevotella, Streptococcus, Veillonella, Leptotrichia, Fusobacterium, etc.
