Did you solve it? You won’t believe these optical illusions!

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她是村子里九个同龄玩伴中,唯一个读完高中、考上大学的人。读书,让唐云霞从小村庄一路走到成都,安家立业,也为下一代换来了更好的成长与教育环境。“我就是读书的受益者,我的经历就是‘读书有用’最鲜活的证明。”

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A different sequencing method that chemically cleaved DNA at specific bases, developed by Allan Maxam and Walter Gilbert, was the dominant technology into the 1980s. Radiolabeled DNA samples were incubated in four separate reactions, each of which contained a chemical that cleaved after a different nucleotide — either A/G, G, C, or C/T. By adding the right amount of each chemical, it was possible to produce different fragments chopped off at each individual base. The sequence could then be read using gel electrophoresis and autoradiography. Maxam–Gilbert sequencing was easier than the plus and minus method to run and interpret, but was eventually surpassed by Sanger’s chain termination method, which molecular biologists found both technically preferable and more “elegant” since it mirrored the natural copying of DNA.

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