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n. A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.

n. A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA.

n. A substance (C5H5N5O) contained in guano.

n. a purine base found in DNA and RNA; pairs with cytosine

"The bird droppings, applied in a 90- minute facial, are packed with an enzyme called guanine – an amino acid which heals the skin, experts claim."

purine   

uracil    adenine    flavin    pyridine    preneoplastic    intra-epithelial    tetrahydrobiopterin    corpses'    palynomorph    borane