Guanine

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In biochemistry, one of the five main bases found in nucleic acids (eg, DNA and RNA). Guanine is a purine derivative and in Watson-Crick base pairing forms hydrogen bonds with cytidine. The nucleoside is called guanosine.

6-hydroxy-2-aminopurine

Guanine is also the name of a white amorphous substance found in the scales of certain fishes, the guano of sea-birds, and the liver and pancreas of mammals.

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