End of 5 '

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Example of double-stranded DNA oligonucleotide with two phosphorylated 5 '(5' end) ends. The 3 '(3' end) ends are not phosphorylated End of 5 '(end of five primers) - End of strand of nucleic acid (DNA or RNA), one of its extreme nucleotides, containing free or phosphorylated 5'-hydroxyl. End 5 'is both a radical and a first nucleotide, because according to the convention, the order of the nucleotides in the molecule is given from the 5' end to the end 3 '.

The linear single-stranded nucleic acid molecule has one end of 5 'and one 3'; double strand - two ends 5 '(one on each strand) and two ends 3'. The circular particle (either single or double stranded) has no free ends.

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