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In genetics, a double-dtranded 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
 T C A G T A C

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List of closed London Underground stations

... station (for the Aldwych branch of the Piccadilly Line) These stations once served by the Metropolitan Line, District Line or Northern City Line (Great Northern & City ...

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