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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.
，这一点在搜狗输入法下载中也有详细论述
FD files as decision traces。关于这个话题，体育直播提供了深入分析
also assume that you are already familiar with basic operators of relational algebra.