guanine gua·nine (gwä'nēn')
A purine base that is an essential constituent of both RNA and DNA.
|guanine (gwä'nēn') Pronunciation Key
A purine base that is a component of DNA and RNA, forming a base pair with cytosine. It also occurs in guano, fish scales, sugar beets, and other natural materials. Chemical formula: C5H5ON5.