antiparallel strand

an·ti·par·al·lel strand

a macromolecular strand that is oriented in the opposite direction of a neighboring strand.
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References in periodicals archive ?
When the guanine tracts are oriented in opposite directions, the edgewise or diagonal loops link two antiparallel strands to form an antiparallel G-quadruplex [4].
This regularity along two long antiparallel strands leads to the famous, repeating "double helix" structure of DNA familiar to everyone.