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[求助] 设计带有一段标签的引物

现在想设计一对引物,在目的基因序列的C端加一段linker(GSSGSGSGSGSG),想加上其对应的一段基因序列GGATCCAGCGGCTCAGGATCTGGATCAGGATCTGGC,即:保护碱基+酶切位点+这段标签序列+目的序列保守区序列。现在我的疑问是:目的序列保守区序列不是要与互补链的互补且从N端写到C端,例如需要扩增的目的序列是ATTCAG.......CCAATTG,那么下游引物就是;保护碱基+酶切位点+(Linker???)+CAATTGG,现在我不知道我这段linker序列怎么加?也互补倒过来写吗?我最后要的序列是这样(CCATGG)NcoI酶切位点......CCACTGACATGGCGCTGCTGCGGG......( GGATCCAGCGGCTCAGGATCTGGATCAGGATCTGGC )linker (CATATG)NdeI酶切位点
麻烦大家帮我解答下下游引物中linker序列怎么放?
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