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Morphological observation of mouse tongue, pharynx, and esophagus. Multiple tumors formed on the tongue, pharynx, and esophagus of a control group mouse (A). Few tumors were observed in these regions in a Glu‐cer group mouse (B). 4‐NQO = 4‐nitroquinoline 1‐oxide; Glu‐cer = glucosylceramide.
