Base pair
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In molecular biology, two nucleotides on opposite complementary DNA or RNA strands that are connected by hydrogen bonds are called a base pair (often abbreviated bp).
In the Watson-Crick base pairing, adenine (A) forms a base pair with thymine (T), and guanine (G) with cytosine (C) in DNA. In RNA, thymine is replaced by uracil (U). But there is also non-Watson-Crick base pairing with other hydrogen bonding patterns, especially in RNA.
