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Guanine (2- amino-6- oxy purine) is one of the four main nitrogenous bases found in nucleic acids (e.g., DNA and RNA). Guanine is a purine derivative and in Watson-Crick base pairing forms hydrogen bonds with cytosine.

The nucleoside is called guanosine.

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.

Purines

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GuanineGuanine (2- amino-6- oxy purine) is one of the four main nitrogenous bases found in nucleic acids (e. DNA and RNA). Guanine is a purine derivative and in Watson-Crick base pairing forms hydrogen bonds with cytosine. The nucleoside is called guanosine.

Guanine-cytosine contentIn genetics, the guanine-cytosine content (GC content) is the ratio of guanine and cytosine to the total number of nucleotides of a given genome. It is used, among other things, to easily distinguish between different species when a doubt remains. The GC-

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