Microscopically, the pulmonary cells proliferated to form neoplastic mass about 22 days after the first administration of urethan.
实验开始后22天，动物肺内即可有肺泡细胞瘤性增生；
Microscopically, the pulmonary cells proliferated to form neoplastic mass about 22 days after the first administration of urethan.
实验开始后22天，动物肺内即可有肺泡细胞瘤性增生；
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