cytosine /cy·to·sine/ (si´to-sēn) a pyrimidine base occurring in animal and plant cells, usually condensed with ribose or deoxyribose to form the nucleosides cytidine and deoxycytidine, major constituents of nucleic acids. Symbol C.
cytosine
cytosine arabinoside cytarabine.
cy·to·sine (s  t -s n )n. Abbr. C A pyrimidine base that is an essential constituent of RNA and DNA. |
cytosine
[sī′təsin]
a pyrimidine base that is a component of DNA and RNA. In free or uncombined form it occurs in trace amounts in most cells, usually as a product of the enzymatic hydrolysis of nucleic acids and nucleotides. On hydrolysis, it is converted to urea and ammonia. See also thymine, uracil.
cytosine
a pyrimidine base found in the nucleic acids, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
cytosine arabinoside
see cytarabine.
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