| 单词 | cytosine | 
| 释义 | cy·to·sine    (sītə-sēn′)n. Abbr. C  A pyrimidine base, C4H5N3O, that is the constituent of DNA and RNA involved in base-pairing with guanine. [CYT(O)- + (RIB)OS(E) + -INE2.]  | 
	
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