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plus and minus method

A variant of the Sanger method of DNA sequencing. A primer is extended by a polymerase to generate a population of newly synthesized deoxyribonucleotides of assorted lengths; the unused dNTPs are removed, and polymerization continues in four pairs of plus and minus reaction mixtures; the minus mixtures have three NTPs and the plus mixtures have only one. After a second polymerization, the mixtures are fractionated by gel electrophoresis, and each plus and minus pair is compared to indicate the length of the new polydeoxyribonucleotide (by the mobilities of the bands) and the position at which polymerization had terminated as a result of the absence of the missing dNTP. Wu, R. (1994) Trends Biochem. Sci. 19, 429-433

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