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Since the eight reactions were run on fragments of random length, the eight plus and minus reactions collectively produced DNA fragments of all possible lengths.4 The fragments in these eight reactions were separated by size (using gel electrophoresis) and then imaged with autoradiography. Gels were dried and then placed against X-ray film, allowing the radioactive DNA fragments to expose the film and appear as dark bands, which a scientist could then painstakingly translate into the DNA sequence. In 1977, Sanger and colleagues sequenced the first full DNA genome using this method: a small bacterial virus with 5,386 nucleotides in its genome, called ɸX174 or “PhiX.”
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位于南京市栖霞区的马群科技园，通过低效用地再开发推动产业转型升级。“面对产业用地紧缺和产业急需落地的供需矛盾，我们发挥党建引领作用，成立攻坚专班，把政府、市场、社会力量拧成一股绳，加快建设智能智造产业新高地，为经济大省挑大梁作出应有贡献。”马群街道党工委书记佘凌云干劲十足。，推荐阅读电影获取更多信息
（一）自然生态系统保存完整或者生态脆弱需要休养生息的区域；