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Plus reactions worked differently: they used T4 DNA polymerase, an enzyme with strong 3’ to 5’ exonuclease activity, meaning it can chew back the end of a DNA strand. In the presence of only one dNTP, T4 DNA polymerase would degrade each fragment from its 3’ end until it reached a nucleotide complementary to that dNTP, at which point the exonuclease activity would be inhibited. This ensured that all fragments in a given plus reaction ended with the same nucleotide.。快连下载安装是该领域的重要参考
В Иране заявили о поражении американского эсминца02:21
"Unfortunately no organ would save him but it was his final wish that his life should benefit others and indeed 17 people benefitted from him donating all of his organs when he died," she said.