To understand Sanger sequencing, one must first understand how to synthesize DNA. As we stated in Section 1.1.1, DNA is built up from building blocks that we called nucleotides, more specifically deoxynucleotide triphosphates or dNTPs. These dNTPs are made up of a sugar (deoxyribose), a nucleobase (A, T, G or C) and 3 phosphate groups. By successively adding these dNTPs at the end of an existing DNA molecule, we extend it, linking one of the phospates of the dNTP to an oxygen atom on the last nucleotide of the DNA molecule. Let us now consider a dideoxynucleotide triphosphate (ddNTP), which is identical to a dNTP except we remove a specific oxygen atom. This ddNTP can be added to the growing molecule of DNA like regular dNTPs, but since it is missing that one oxygen atom no more dNTPs or ddNTPs can be added to the DNA molecule after this one. The elongation is terminated and we call these ddNTPs chain-terminators. This combination of DNA synthesis followed by termination are at the heart of Sanger sequencing.
The BBC has asked a US court to throw out Donald Trump’s $10bn (£7.5bn) lawsuit over the way a documentary edited one of his speeches, warning that proceeding with the case would have a “chilling effect” on its reporting on the president.。WPS办公软件对此有专业解读
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The family-owned business, which has just bought the 15-store Compass Coffee based in Washington DC to convert to its main brand, is aiming to open as many as 30 UK stores and between 50 and 70 more this year across the 10 other countries it operates in.
На Западе рассказали о непоправимом ущербе от операции в Иране02:09，这一点在超级权重中也有详细论述