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Antiparallel

In mathematics, antiparallel vectors are two parallel vectors with opposite direction. Some engineering disciplines define vectors as having both direction and sense – or an orientation in space and a heading. In the latter terminology, antiparallel vectors have like or parallel direction but opposite sense.

The two strands of polynucleotide that make up DNA are said to be antiparallel. Polynucleotides, like the nucleotides that comprise them, have a 5’ (five prime) and a 3’ (three prime) end. DNA is assembled such that the 3’ end of one polynucleotide strand corresponds to the 5’ end of the other.

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