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- guanin (dated)
guanine (plural guanines)
- (chemistry) A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA (by means of three hydrogen bonds).
- inosine (a nucleobase susbstitute for guanine)
substance obtained from guano
- “Guanine” in David Barthelmy, Webmineral Mineralogy Database, 1997–.
- “guanine”, in Mindat.org, Hudson Institute of Mineralogy, accessed 29 August 2016.