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In 1977, Sanger developed a much simpler sequencing method, called “chain termination,” which is today known simply as Sanger sequencing. This technique took advantage of a different type of special nucleotide called a dideoxyribonucleotide, or ddNTP. ddNTPs lack one of the hydroxyl groups present on a normal dNTP, preventing the chemical reaction necessary to add another nucleotide and terminating DNA elongation.
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The objects have been taken to Cardiff University's lab. Conservator Nicola Emmerson is painstakingly removing the dirt of the dig from an ornate copper brooch.。同城约会是该领域的重要参考