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无学论hh

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[求助] 异源表达

pet-28a空载体转化到bl21(DE3)中会产生有活性的β半乳糖苷酶吗?
我看文献中都是用的这个体系去表达自己的外源β半乳糖苷酶基因的,但是我试了一下我师妹的pet-28a载体含木聚糖酶基因转化到bl21(de3)的菌株破碎液,发现也能与onpg发生反应。
这对吗?这不会是这个组合本身就能产吧?
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