However, recent advances in molecular biology, genetics, and stem cell biology have provided scientists a new window onto the impact of toxic substances on the cellular and molecular level.

然而，最近分子生物学，遗传学和干细胞生物学方面的进步，已经为科学家在毒性物质对细胞和分子水平的影响方面提供了一个新窗口。

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The types of rolled-leaf mutant were introduced, and the potential mechanism from the aspects of the cellular level, hormonal regulation, molecular genetics and environmental factors were reviewed.

介绍了卷叶突变体的类型，并从细胞水平、激素调控、分子遗传及环境因素等方面综述了叶卷曲突变体发生的机制。

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