Medical term:

guanine


guanine

 [gwah´nēn]
a purine base, one of the fundamental components of nucleic acids (DNA and RNA).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

guan·ine (Gua, G),

(gwahn'ēn, -in),
2-Amino-6-oxypurine; one of the two major purines (the other being adenine) occurring in all nucleic acids.
Farlex Partner Medical Dictionary © Farlex 2012

guanine

(gwä′nēn′)
n. Abbr. G
A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

gua·nine

(G) (gwah'nēn)
One of the two major purines (the other being adenine) occurring in all nucleic acids.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

guanine

One of the two purine bases of double-ring structure (the other being ADENINE) which, with the PYRIMIDINE bases form the ‘rungs of the ladder’, and the genetic code, in the double helix deoxyribonucleic acid (DNA) molecule. Guanine is also one of the ribonucleic acid (RNA) bases.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Guanineclick for a larger image
Fig. 183 Guanine . Molecular structure.

guanine (G)

one of four types of nitrogenous bases found in DNA, having the double-ring structure of a class known as PURINES. Guanine forms part of a DNA unit called a NUCLEOTIDE and always forms complementary pairs with a DNA pyrimidine base called CYTOSINE. Guanine also occurs in RNA molecules.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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