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SARS-CoV-2 S基因表达载体的构建和验证 M. DNA marker ;A1. S基因PCR扩增产物;B1.质粒pcDNA3.1,B2. 质粒pcDNA3.1双酶切产物;C1.阴性对照,C2~6.阳性单克隆菌落菌液PCR扩增产物;D1. 质粒pcDNA3.1-S,D2.质粒pcDNA3.1-S双酶切鉴定产物。