guanine
A purine base.
Guanine (2-amino-6-oxypurine) is one of five organic bases found in the
nucleic acids of cells. It pairs with
cytosine in both DNA
and RNA. Guanine is named for its occurrence
in guano, a natural fertilizer
composed mainly of the excrement of seabirds and bats. Guanosine
is a compound containing guanine and the sugar ribose.
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