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a purine base present in nucleoproteins of cells of plants and animals; adenine and guanine are essential components of nucleic acids. The end product of the metabolism of adenine in humans is uric acid. A preparation of adenine is used to improve the preservation of whole blood. Symbol A.
adenine arabinoside (ara-A) vidarabine.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ad·e·nine (A, Ade),

One of the two major purines (the other is guanine) found in both RNA and DNA, and also in various free nucleotides of importance to the body (for example, AMP (adenylic acid), ATP, NAD+, NADP+, and FAD); in all these smaller compounds, adenine is condensed with ribose at nitrogen-9, forming adenosine. For structure, see adenylic acid.
Synonym(s): 6-aminopurine
Farlex Partner Medical Dictionary © Farlex 2012


(ăd′n-ēn′, -ĭn)
n. Abbr. A
A purine base, C5H5N5, that is the constituent involved in base pairing with thymine in DNA and with uracil in RNA.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


One of 2 (the other is thymine) major purine bases (C5H5N5) in nucleic acid. Adenine pairs with a pyrimidine in nucleic acids—with thymine in DNA, or with uracil in RNA; adenine combines with deoxyribose to form deoxyadenosine in DNA and ribose to form adenosine in RNA. Adenine is a major factor in a plethora of biological and molecular reactions.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


(A, Ade) (ad'ĕ-nēn)
One of the two major purines (the other being guanine) found in both RNA and DNA, and also in various free nucleotides.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A purine base. One of the four key biochemical units from which genes are formed in DNA and by which the two helical halves of the DNA molecule are linked together. Adenine pairs with thymine in DNA, but in RNA it pairs with uracil.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Adenineclick for a larger image
Fig. 14 Adenine . Complementary pairing. P = phosphate group.
Adenineclick for a larger image
Fig. 13 Adenine . Molecular structure.

adenine (A)

one of four types of nitrogenous bases found in DNA, having the double-ring structure of a class known as PURINES (see Fig. 13 ).

Adenine forms part of a DNA unit called a NUCLEOTIDE and always forms COMPLEMENTARY BASE PAIRING with a DNA PYRIMIDINE base called THYMINE (see Fig. 14 ). When pairing with RNA during TRANSCRIPTION, adenine is complementary to URACIL. Adenine also occurs in RNA molecules, ATP, ADP and AMP.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


A purine found in both RNA and DNA, and also in various free nucleotides of importance to the body.
Medical Dictionary for the Dental Professions © Farlex 2012