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Unilateral olfactory epithelium atrophy (arrowhead), olfactory nerve atrophy (thin arrows), and metaplasia of olfactory epithelium to respiratory epithelium in the dorsal meatus of level III in a male mouse administered 1,000 mg/kg green tea extract (GTE) by gavage for 3 months. Note the normal aspect of the olfactory nerves in the lamina propria of the unaffected side (thick arrows). H&E, X16.
