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[求助] PCR大小老不对啊

本人要克隆一个2700bp左右的片段并连接目标载体,采用EcoR1酶切位点进行扩增,酶切后片段大小变成3000左右了……目标载体也连接不上……各位大神,有没有知道怎么办的啊

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