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2 definitions found
 for cytosine
From The Collaborative International Dictionary of English v.0.48 :

  cytosine \cy"to*sine\ (s[imac]"t[-o]*s[i^]n or
     s[imac]"t[-o]*s[=e]n), n. (Biochemistry)
     A pyrimidine ({C4H5N3O) which is one of the four major basic
     components of DNA and RNA in most organisms, forming
     glyosides with ribose and deoxyribose. It is the basic
     component of cytidine, deoxycytidine, cytosine, cytidine
     monophosphate, and derivatives of those compounds.

From WordNet (r) 3.0 (2006) :

      n 1: a base found in DNA and RNA and derived from pyrimidine;
           pairs with guanine [syn: cytosine, C]

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