Complementary
In genetics, a double-stranded DNA or RNA strand consists of two complementary strands of base pairs, which are non-covalently connected via two or three hydrogen bonds.
Since there is only one complementary base for any of the bases found in DNA/RNA, one can reconstruct a complementary strand for any single strand. This is essential for DNA replication.
For example, the complementary strand of the DNA sequence
A G T C A T G
is
T C A G T A C
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