One of the nitrogenous bases in DNA and RNA. It is the complement of cytosine.

structural formula of guanine:

 H      N           O
  \ //     \      //
   C        C -- C
    \      //     \
     N -- C        N -- H
           \      /
            N == C
                  \
                   N -- H
                  /
                 H

See also: adenine, thymine, cytosine, and uracil.

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