[求救] 將建構好的質體放入expression host
小弟現在碰到一個很奇怪的問題
就如同標題所說
我將建構好的質體(pET20b + insert DNA)用電穿孔的方式放入BL21(DE3)
但是做了三次都沒成功 而且質體使用的量是一次比一次多
第一次用3ng 第二次用15ng 第三次用30ng
我回頭去測試competent cell是不是有問題
所以使用沒有insert DNA的pET20b
結果使用3ng的pET20b就長了整盤
請問有人碰過這樣的狀況嗎
該怎麼解決呢?
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