A-family DNA polymerase

Additional nucleic acids as their triphosphates may add to the 3 end of the existing oligonucleotide. This entire process is catalyzed and controlled by DNA polymerases, a family of enzymes that can replicate and repair DNA. The synthesis of DNA is always performed in the 5 to 3 direction.2 Furthermore, oligonucleotide strands are written with the letters of the nucleic acid monomers, starting from the 5 end. Oligonucleotide abbreviations should be read with an open mind because the literature contains many slightly different notation styles. 

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See also in sourсe #XX -- [ ]

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