It was proved that plasmid pZ/EG-AS was effective and there was no gene seepage, only with the participation of Cre recombinase, S gene could be activated to express. 3.

• 结果表明：质粒pZ/EG-AS不存在基因渗漏现象，只有在Cre重组酶的参与下才能激活S基因表达。