a crystalline purine base, CHNO, contained in the nucleic acids of all tissue: it links with cytosine in the DNA structure
Origin of guaninefrom guano (a commercial source of the base) + -ine
A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.
Origin of guanineFrom guano in which it is found
From guano + -ine.