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采用致癌剂0.5％DMBA丙酮溶液每周三次涂于金地鼠颊囊粘膜,于用药第五周出现上皮单纯性增生,
Carcinogen 0.5% DMBA acetone solution was applied to the golden hamster cheek pouch mucosa three times a week. Epithelial hyperplasia occurred in the fifth week of treatment.