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cytosine arabinoside cytarabine.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cy·to·sine (Cyt),

A pyrimidine found in nucleic acids.
Farlex Partner Medical Dictionary © Farlex 2012


n. Abbr. C
A pyrimidine base, C4H5N3O, that is the constituent of DNA and RNA involved in base-pairing with guanine.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


(Cyt) (sī'tō-sēn)
A pyrimidine found in nucleic acids.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A pyrimidine base, one of those forming the genetic code of DNA and RNA.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Cytosineclick for a larger image
Fig. 128 Cytosine . Molecular structure.

cytosine (C)

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