But the mechanism of the tumorigenesis of SV 40 Tag is not clear.

目前对SV40在肿瘤发生过程中所扮演的具体角色和确切机制还不十分清楚.

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AIM : To clone fibronectin ( FN ) promoter and identify its transcriptional activity combined with SV 40 enhancer.

目的: 克隆纤维连结蛋白 ( FN ) 启动子和检测其转录活性,并初步研究增加SV40增强子对其转录活性的影响.

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