LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
Cytosine. Molecular model of the nucleobase cytosine (2-oxy-4-aminopyrimidine). This is a pyrimidine-derived nucleobase found in the genetic molecules DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Cytosine is one of the bases found in RNA and DNA. The positioning of these bases along the RNA and DNA chains is known as the genetic code. Each genetic code is unique and gives organisms their individual characteristics. The chemical formula of cytosine is C4.H5.N3.O. In this ball-and-stick model the individual atoms are colour-coded: carbon (black), hydrogen (white), nitrogen (dark blue) and oxygen (red). The double bonds (light blue) are shown.
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