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目的 :FEN - 1是一种结构特异性核酸酶 ,它识别特定的核酸分叉结构 ,并切除含有游离 5’末端的单链核酸。FEN - 1具有对DNA复制和修复都必需的双重功能。对酵母和体外实验的研究表明 ,
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在电子商务的环境中,一切都是虚拟的没有真实感,与传统的面面交易相比,网络购物则普遍给人以不安全感.电子商务的网店突破了时间和地点的限制,具有形式方便,成本费用低,效率
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