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Base pair

unit consisting of two nucleobases bound to each other by hydrogen bonds: either adenine–thymine or guanine–cytosine in natural DNA (additional types occur in RNA)
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In molecular biology, two nucleotides on opposite complementary DNA strands that are connected by hydrogen bonds are called a base pair (often abbreviated bp).

In DNA pairing, adenine (A) forms a base pair with thymine (T), to form an A/T base pair. Guanine (G) pairs with cytosine (C) in DNA, to form a G/C base pair.

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