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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.，更多细节参见51吃瓜
The Trump administration is slowly dismantling the federal disaster management system that protects the nation from chemical catastrophes, such as fires and explosions at high-risk facilities.
Punch, a baby macaque that stole the hearts of animal lovers around the world, is outgrowing his Ikea djungelskog plushie that comforted him after he was initially rejected by his mother and other monkeys at a zoo in Japan.