植物基因工程研究的关键问题是向植物中转移外源基因，它主要涉及植物受体的选择和基因转移方法的探索。
Gene transfer is the key point in plant gene engineering research, which covers choosing plant accepter and exploring gene transfer approach.
基因治疗的成功有赖于安全有效的基因转移方法和高水平表达的外源基因。
Successful gene therapy relies on safe and efficient gene transfer methods and high level expression of foreign gene.
结论：外源野生型PTEN基因的转染能导致体外培养的高转移性黏液表皮样癌细胞变性、坏死或凋亡。
Conclusion: the exogenous PTEN gene may induce denaturalization, necrosis, and apoptosis of the highly metastatic mucoepidermoid carcinoma cells.
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