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4In 2007, Barrangou et al. demonstrated for the first time the function of CRISPR/Cas9 as a defensive mechanism of bacteria against bacteriophage attacks by a technique called “plaquing” which builds upon the technique of “plating” bacteria on agar. Plaques of viruses on agar are areas without growth of bacteria due to viral attacks.。服务器推荐对此有专业解读
（一）行政执法人员资格、证件管理制度；。91视频对此有专业解读
Stuart RustSouth of England