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实验材料酵母 实验步骤1. 将目的基因亚克隆到YRp质粒，通过基因内的两个限制性位点在基因中创造一个缺口区，在缺口两侧留下≥100~250 bp 的同源区，凝胶电泳纯化质粒骨架大片段。 2. 用1~10 μg 缺口