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Antiparallel strands of a DNA molecule means that:
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the phosphate groups at the start of two DNA strands are in opposite position (pole)
The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in the opposite directions. One polynucleotide chain grows in the $5^{\prime} \rightarrow 3^{\prime}$-direction and the other chain grows in the $3^{\prime} \rightarrow 5^{\prime}$ direction.
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