: a purine base C5H5N5O that codes genetic information in the polynucleotide chain of DNA or RNA compare adenine, cytosine, thymine, uracil
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According to new research, the secret to its distinctive hue lies in its tooth-like scales, called dermal denticles, which contain guanine crystals and melanosomes that reflect and absorb wavelengths respectively.—Rosie McCall, Discover Magazine, 14 July 2025 Biology’s four bases—adenine (A), thymine (T), cytosine (C) and guanine (G)—encode the instructions that keep life alive.—Andrew Whalen, Forbes.com, 9 July 2025 The metaphor leaps out: Like letters of the alphabet, molecules (the nucleotide bases A, T, C and G, for adenine, thymine, cytosine and guanine) are arranged into sequences — words, paragraphs, chapters, perhaps — in every organism, from bacteria to humans.—Ingrid Wickelgren, Quanta Magazine, 5 Feb. 2025 The team also detected adenine, guanine, cytosine, thymine and uracil — all five of the biological nucleobases, or components that make up the genetic code in DNA and RNA.—Ashley Strickland, CNN, 29 Jan. 2025 See All Example Sentences for guanine
Word History
Etymology
guano + -ine; from its being found especially in guano
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