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

structural formula of cytosine:

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

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

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