A nucleoside (a building block of RNA) composed of guanine base attached to a ribose sugar, found throughout living cells.
From guanine + -ose (sugar suffix), scientifically named in the early 20th century as biochemists catalogued the components of nucleic acids.
Guanosine is literally part of the instruction manual for every living thing—it's one of the four letters that spells out your entire genetic code!
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