Method The epithelial cell ultramicrostnsctures in tongue carcinogenesis induced by 4-nitroquinoline-l-oxide (4NQO) were observed by transmission electron microscope.

• 方法口服4NQO诱发大鼠舌粘膜癌变，透射电镜动态观察癌变过程中细胞的超微结构变化。