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[求助] 质粒构建

构建真核表达质粒,在CAG启动子和hygromycin的CDS区的cDNA之间的序列,插入GCCACCATG,之后紧接着TAG,hygro是不是就不能翻译出来了。根据核糖体扫描模型,核糖体识别GCCACCATG,开始翻译,但是接着是TAG终止密码子,应该就终止了。但是实际情况是,电转的细胞,hygro表达了,因为它是抗性基因,用hygromycin杀细胞,最后有克隆,也有荧光。这我就解释不通了,希望大家帮我一下,谢谢了。
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