thus, the bottom strand (complementary strand) is written 3´ to 5´.
: A base-paired DNA sequence:
::
::
: The corresponding RNA sequence, in which uracil is substituted for thymine in the RNA strand:
::
::

Non-canonical base pairing

In addition to the canonical Watson-Crick pairing (AoT/U GoC), some conditions can also favour base-pairing with alternative base orientation, and number and geometry of hydrogen bonds. These pairings are accompanied by alterations

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