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Gut microbiota and colorectal tumor. Large number of invasive bacteria in a colon tumor detected by fluorescence in situ hybridization (FISH) (a) and transmission electron microscopy (TEM) (b). Bacterial biofilms on the surface of a colon adenoma detected by FISH (c) and scanning electron microscopy (SEM) (d). FISH, ×100 magnification; TEM, ×3000 magnification; SEM, ×7000 magnification
Modified from Ref. [35]
